LTC221/LTC222
1
2212fa
■
Micropower Operation
■
Single 5V or ±15V Supply Operation
■
Low Charge Injection
■
Low R
ON
■
Low Leakage
■
Guaranteed Break Before Make
■
Latch Resistant Design
■
TLL/CMOS Compatible
■
Improved Second Source for DG221/DG222
■
Microprocessor Bus Compatible
The LTC
®
221 and LTC222 are micropower, quad CMOS
analog switches which typically dissipate only 250µW
from ±15V supplies and 40µW from a single 5V supply.
Onboard latches allow the LTC221 and LTC222 to inter-
face directly to most microprocessor buses. The switches
have 65Ω typical on resistance and a very high off resis-
tance. A break before make characteristic is inherent in
these switches to prevent the shorting of two channels.
The signal range is ±15V with a supply voltage of ±15V and
0V to 5V with a single 5V supply. The switches have special
charge compensation circuitry which greatly reduces
charge injection to a maximum of ±25pC (±15V supplies).
The LTC221 and LTC222 are designed for applications
such as microprocessor controlled programmable gain
amplifiers, automatic test equipment, communication
systems, and data acquisition systems. The LTC221 is
normally closed and the LTC222 is normally open as
shown in the Logic Table.
Micropower, Low Charge
Injection, Quad CMOS Analog
Switches with Data Latches
, LTC and LT are registered trademarks of Linear Technology Corporation.
FEATURES
DESCRIPTIO
U
■
Supply Current ..................... I
+
= 40µA, I
–
= 5µA Max
■
Charge Injection
±15V Supplies .................................±25pC Max
Single 5V Supply .................................. 2pC Typ
■
R
ON
............................................................... 65ΩTyp
■
Signal Range ..................................................... ±15V
Two-Channel, 12-Bit, Self Calibrating Data Acquisition System
KEY SPECIFICATIO S
U
LTC221/222 • TA01
5V
R1
15V
IN
–IN
10k
150k 100k
120Ω270Ω
GND IN3
IN4
WR WR
TO MICROPROCESSOR
e.g. TMS320C25
IN2
IN1
CS
D
OUT
V
REF
V
FS
CLK
GND
D1S1
D2S2
V
IN
OV TO 5V
V
FS
D3S3
D4S4
5V V
+
V
–
–15V
15V
LTC221/LTC222
LT1006
+
–
LOGIC
DECODER
LTC1292
12-BIT
ADC SERIAL PORT
DATA BUS B0 – B3
ADDRESS BUS
LT1027
TYPICAL APPLICATIO
U
LTC221/LTC222
2
2212fa
TOP VIEW
J PACKAGE
16-LEAD CERDIP
N PACKAGE
16-LEAD PDIP
JMAX = 110°C, θJA = 120°C/W
S PACKAGE
16-LEAD PLASTIC SO
JMAX = 110°C, θJA = 130°C/W
ORDER PART
NUMBER
LTC221CN
LTC221CS
LTC222CN
LTC222CS
LTC221MJ
LTC221CJ
LTC222MJ
LTC222CJ
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
IN1
D1
S1
V
–
GND
S4
D4
IN4
IN2
D2
S2
V
+
WR
S3
D3
IN3
LTC221M/LTC222M LTC221C/LTC222C
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
Analog Signal Range
●
±15 ±15 V
RON VS = ±10V TMIN 90 90 Ω
ID = 1mA 25°C65906590Ω
TMAX 135 135 Ω
Off Input Leakage IS (OFF) VD = 14V, VS = ±14V 0.01 ±1 0.01 ±5nA
●
±100 ±100 nA
Off Output Leakage ID (0FF) VIN = 2.4V, LTC221 0.01 ±1 0.01 ±5nA
VIN = 0.8V, LTC222
●
±100 ±100 nA
On Channel Leakage lD (ON) VD = VS = ±14V, VIN = 2.4V, LTC222 0.02 ±1 0.02 ±5nA
VIN = 0.8V, LTC221
●
±200 ±200 nA
Input High Voltage VINH, VWRH
●
2.4 2.4 V
Input Low Voltage VINL, VWRL
●
0.8 0.8 V
Input High or Low Current VIN = 15V, 0V
●
±1±1µA
IINH, IINL, IWRH, IWRL VWR = 15V, 0V
CS (OFF) 55pF
CD (OFF) 12 12 pF
CD, CS (ON) 30 30 pF
I+All Channels On or Off 16 40 16 40 µA
VIN = VWR = 0V or 4.0V
●
60 60 µA
Voltages Referenced to V
–
V
+...........................................................................................
44V
GND..................................................................... 25V
Digital Inputs, S, D (Note 2) .......... – 2V to (V
+
2V) or
Digital Inputs, S, D (N2020mA, Whichever Occurs First
Current
Any Input Except S or D ................................... 30mA
Continuous S or D ............................................ 20mA
Peak S or D
(Pulsed at 1 ms, 10% Duty Cycle Max) ......... 70mA
ESD Susceptibility (Note 3) ......................................4kV
Power Dissipation (Plastic) ............................... 500mW
Power Dissipation (Ceramic) ............................. 900mW
Operating Temperature Range
LTC221C/LTC222C .................................. 0°C to 70°C
LTC221M/LTC222M (OBSOLETE).......–55°C to 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
(Note 1)
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
INX WR LTC221 LTC222
00 On Off
10 Off On
X1Maintain Previous State Maintain Previous State
DIGITAL A D DC ELECTRICAL CHARACTERISTICS
U
LOGIC TABLE
The
●
denotes the specifications which apply
over full operating temperature range, otherwise specifications are at T
A
= 25
°
C. V
+
= ±15V, V
–
= –15V, GND = 0V, unless noted.
OBSOLETE PACKAGE
Consider the N or S Package for Alternate Source
LTC221/LTC222
3
2212fa
V+ = 15V, V– = –15V, GND = 0V, unless otherwise noted.
LTC221M/LTC222M LTC221C/LTC222C
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
tON VS = 2V, RL = 1kΩ, CL = 35pF 290 400 290 400 ns
tOFF 210 300 210 300
tOPEN 20 85 20 85 ns
Off Isolation VS = 2Vp-p, RL = 1kΩ75 75 dB
Crosstalk f = 100kHz 90 90
Charge Injection OINJ RGEN = 0Ω, CL = 1000pF, VGEN = 0 5 ±25 8 ±25 pC
Total Harmonic Distortion THD VS = 2Vp-p, RL = 10kΩ0.01 0.01 %
tON, WR VS = 2V, RL = 1kΩ, CL = 35pF 270 400 270 400 ns
tOFF, WR 160 300 160 300
LTC221M/LTC222M LTC221C/LTC222C
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
I–0.1 5 0.1 5 µA
●
10 10
LTC221M/LTC222M LTC221C/LTC222C
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
Analog Signal Range
●
0505 V
RON VS = 1.5V, 3V TMIN 450 520 Ω
ID = 0.25mA 25°C 280 450 280 520 Ω
TMAX 650 650 Ω
Off Input Leakage IS (OFF) VD = 4V, 1V; VS = 1V, 4V 0.01 ±1 0.01 ±5nA
(Note 4)
●
±100 ±100 nA
Off Output Leakage ID (0FF) 0.01 ±1 0.01 ±5nA
●
±100 ±100 nA
On Channel Leakage lD (ON) VD = VS = 1V, 4V 0.01 ±1 0.01 ±5nA
(Note 4)
●
±200 ±200 nA
Input High Voltage VINH, VWRH
●
2.4 2.4 V
Input Low Voltage VINL, VWRL
●
0.8 0.8 V
Input High or Low Current VIN = 5V, 0V
●
±1±1µA
IINH, IINL, IWRH, IWRL VWR = 5V, 0V
CS(OFF) 5 5 pF
CD (OFF) 12 12 pF
CD, CS (ON) 30 30 pF
I+ All Channels On or Off 8 20 8 20 µA
VIN = VWR = 0V or 4.0V
●
30 30 µA
AC ELECTRICAL CHARACTERISTICS
DIGITAL A D DC ELECTRICAL CHARACTERISTICS
U
DIGITAL A D DC ELECTRICAL CHARACTERISTICS
U
The
●
denotes the specifications which apply
over full operating temperature range, otherwise specifications are at T
A
= 25
°
C. V
+
= ±15V, V
–
= –15V, GND = 0V, unless noted.
The
●
denotes the specifications which apply
over full operating temperature range, otherwise specifications are at TA = 25
°
C. V+ = 5V, V– = GND = 0V, unless noted.
LTC221/LTC222
4
2212fa
LTC221/222 • TPC05
V
IN
(V)
0
I
+
(µA)
150
200
250
4
100
50
01235
ALL I
NX
TIED TOGETHER
WR TIED TO GROUND
ALL LOGIC INPUTS
TIED TOGETHER
V
+
= 5V
V
–
= 0V
T
A
= 25°C
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Signals on S, D, or IN exceeding V
+
or V
–
will be clamped by
internal diodes. Limit forward diode current to maximum current rating.
RON vs VS Over Supply Voltage
AC ELECTRICAL CHARACTERISTICS
Note 3: In-circuit ESD on the switch pins (S or D) exceeds 4kV (see test
circuit).
Note 4: Leakage current with a 5V supply is guaranteed by correlation with
the ±15V leakage current.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
RON vs VS Over Temperature RON vs VS Over Temperature
Positive Supply Current vs
Logic Input Voltage
Positive Supply Current vs
Logic Input Voltage
LTC221/222 • TPC01
V
S
(V)
–16
R
ON
(Ω)
150
12
100
50
200
250
0–8 0
–12–20 16
–4 4820
T
A
= 25°C
I
D
= 1mA
±5V
±10V
±20V
V
SUPPLY
= 5V, OV
±15V
LTC221/222 • TPC04
V
IN
(V)
0
I
+
(µA)
150
200
250
12
100
50
036915
V
+
= 15V
V
–
= –15V
T
A
= 25°C
ALL I
NX
TIED TOGETHER
WR TIED TO GROUND
ALL LOGIC INPUTS
TIED TOGETHER
LTC221/222 • TPC02
V
S
(V)
R
ON
(Ω)
–12
60
9
40
20
80
100
0–6 0
–9–15 12
–3 3615
V
+
= 15V
V
–
= –15V
I
D
= 1mA
–55°C
125°C
25°C
LTC221/222 • TPC03
V
S
(V)
R
ON
(Ω)
300
4
200
100
400
500
010 235
V
+
= 5V
V
–
= 0V
I
D
= 1mA
–55°C
125°C
25°C
V+ = 5V, V– = GND = 0V, unless otherwise noted.
LTC221M/LTC222M LTC221C/LTC222C
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
tON VS = 2V, RL = 1kΩ, CL = 35pF 450 600 450 600 ns
tOFF 190 300 190 300 ns
tOPEN 100 250 100 250 ns
Off Isolation VS = 2VP-P, RL = 1kΩ75 75 dB
Crosstalk f = 100kHz 90 90 dB
Charge Injection OINJ RGEN = 0Ω, CL = 1000pF, VGEN = 2.5V 2 2 pC
Total Harmonic Distortion THD VS = 2VP-P, RL = 10kΩ0.01 0.01 %
tON, WR VS = 2V, RL = 1kΩ, CL = 35pF 430 600 430 600 ns
tOFF, WR 160 300 160 300 ns
LTC221/LTC222
5
2212fa
Switching Time Test Circuit
Switch output waveform shown for V
S
= constant with
logic input waveform as shown. Note that V
S
may be (+)
or (–) as per switching time test circuit. V
O
is the steady
APPLICATIO S I FOR ATIO
WUUU
state output switch on. Feedthrough via gate capacitance
may result in spikes at leading and trailing edge of output
waveform.
CCRR-Channel to Channel Crosstalk Test Circuit
Switching Time Test Circuit
Charge Injection Test Circuit
OIRR-Off Isolation Test Circuit
LTC221/222 • AI01
V
S
OV
OV
OV
3V
3V
LTC222
LOGIC INPUT
t
r
< 20ns
t
r
< 20ns
LTC221
LOGIC INPUT
t
r
< 20ns
t
r
< 20ns
SWITCH
INPUT
SWITCH
OUTPUT
50%
50%
V
O
0.9 0.9
LOGIC "0" = SW ON
LOGIC "1" = SW ON
V
O
t
ON
t
OFF
LTC221/222 • AI02
S1 D1
(REPEAT TEST FOR IN2, IN3 AND IN4)
VO
CL
35pF
RL
1k
RL
RL+ RDS(ON)
VO = VS
IN1
SWITCH
OUTPUT
SWITCH
INPUT
LOGIC
INPUT
VS = 2V
LTC221/222 • AI03
SX
R
GEN
V
GEN
DX
INX
V
O
C
L
= 1000pF
LTC221/222 • AI04
OV
OV
3V
3V
V
O
LTC221 INX
LTC222 INX
∆V
O
∆V
O
IS THE MEASURED VOLTAGE ERROR DUE TO CHARGE INJECTION.
THE ERROR VOLTAGE IN COULOMBS IS ∆Q = V
L
• ∆V
O
OFF
OFF
ON
ON
ON
ON
LTC221/222 • AI05
V
S
V
+
V
–
C
OIRR = 20 LOG
C = 0.001µF//0.1µF
CHIP CAPACITORS
SIGNAL
GENERATOR
C
15V
–15V
V
D
GND
V
IN
INX
V
S
V
D
R
L
1k
V
S
= 2V
P-P
f = 100kHz
CHAN A
ANALYZER
CHAN B
LTC221/222 • AI06
VS1 V+
V–
C
OIRR = 20 LOG
C = 0.001µF//0.1µF
CHIP CAPACITORS
SIGNAL
GENERATOR
C
NC
50Ω
15V
–15V
VD2 VS2
VD1
VL
GND
VIN
VIN
IN2IN1
VS1
VD2
RL
1k
VS = 2Vp-p
f = 100kHz
CHAN A
ANALYZER
CHAN B
LTC221/LTC222
6
2212fa
In-Circuit ESD Test Circuit
APPLICATIO S I FOR ATIO
WUUU
LTC221/222 • TA07
LTC221/
LTC222
GND
V
–
–15V
15V
1.5k
ANY SOURCE OR DRAIN PIN
ESD TESTER
POWER APPLIED
OR OPEN CIRCUT
PER MIL-STD-883C
METHOD 3015.2
±4kV
100pF 0.1µF
0.1µF
V
+
S OR D
LTC221/222 • AI08
LTC221 IN
LTC222 IN
V
S
V
O
0V
0V
0V
0V
3V
3V
WR
3V
LOGIC INPUT
t
r
< 20ns
t
r
< 20ns
50% 50%
V
O
0.9 0.9V
O
t
ON
t
OFF
WR
WR
LTC221/222 • AI09
S1 D1
(REPEAT TEST FOR
IN2, IN3 AND IN4)
V
O
C
L
35pF
R
L
1k
IN1
R
L
R
L
+ r
DS(ON)
V
O
= V
S
SWITCH
OUTPUT
SWITCH
INPUT
LOGIC
INPUT
LOGIC
INPUT
V
S
= 2V
WR
V
–
–15V
15V
V
+
GND
OV
LTC221/222 • AI10
LTC221 IN
LTC222 IN
OV
OV
OV
3V
3V
3V
t
DW
t
WW
t
WD
WR 1.5V 1.5V
0.8V0.8V
2.4V2.4V
WR Switching Time Test Circuit
WR Setup Conditions WR/Input Minimum Timing Requirements
PARAMETER MIN LIMIT UNITS
t
WW
Write Pulse Width 230 ns
t
DW
Data Valid to Write 180 ns
t
WD
Data Valid After Write 30 ns
LTC221/LTC222
7
2212fa
Auto Ranging an 8-Channel, 10-Bit A/D Converter
APPLICATIO S I FOR ATIO
WUUU
LTC221/222 • AI11
GND
IN3
IN4
WR
WR
IN2
IN1
D1S1
D2S2
V
IN
OV – 5V
D3S3
D4S4
V–
LTC221/
LTC222
LOGIC
DECODER
DATA BUS B0 – B3
TO
MICROCONTROLLER
e.g. HD64180
ADDRESS BUS
LT1027
SERIAL PORT
LTC1090
5V
5V
15V
15V
15V
2.49kΩ
4.99kΩ
10kΩ
20kΩ
LT1006
+
–
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM
DGND AGND
CS
D
OUT
V
CC
D
IN
ACLK
SCLK
REF
+
REF
–
V
–
LTC221/LTC222
8
2212fa
8-Channel, 14-Bit A/D Converter
APPLICATIO S I FOR ATIO
WUUU
LTC221/222 • AI12
GND
IN3
IN4
WR
WR
IN2
IN1
D1S1
D2S2
V
IN
0V TO 5V
D3S3
D4S4
V
–
LTC221/
LTC222
LOGIC
DECODER
DATA BUS B0 – B3
TO
MICROCONTROLLER
e.g. TMS370
ADDRESS BUS
LT1027
LTC1090
5V
15V
1kΩ1kΩ1kΩ
1kΩ
15V
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM
DGND AGND
CS
D
OUT
D
IN
ACLK
SCLK
REF
+
REF
–
V
–
SERIAL PORT
LTC221/LTC222
9
2212fa
U
PACKAGE DESCRIPTIO
OBSOLETE PACKAGE
J16 0801
.015 – .060
(0.380 – 1.520)
.100
(2.54)
BSC
.014 – .026
(0.360 – 0.660)
.045 – .065
(1.143 – 1.651)
.200
(5.080)
MAX
.125
(3.175)
MIN
.008 – .018
(0.203 – 0.457) 0° – 15°
12345678
.220 – .310
(5.588 – 7.874)
.840
(21.336)
MAX
.005
(0.127)
MIN 16 13 9
10
11121415
.025
(0.635)
RAD TYP
.300 BSC
(7.62 BSC)
.045 – .065
(1.143 – 1.65)
FULL LEAD
OPTION
.023 – .045
(0.584 – 1.143)
HALF LEAD
OPTION
CORNER LEADS OPTION
(4 PLCS)
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE
OR TIN PLATE LEADS
J Package
16-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
LTC221/LTC222
10
2212fa
U
PACKAGE DESCRIPTIO
N Package
16-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
N16 0502
.255 ± .015*
(6.477 ± 0.381)
.770*
(19.558)
MAX
16
12345678
910
11
12
13
14
15
.020
(0.508)
MIN
.125
(3.175)
MIN
.130 ± .005
(3.302 ± 0.127)
.065
(1.651)
TYP
.045 – .065
(1.143 – 1.651)
.018 ± .003
(0.457 ± 0.076)
.100
(2.54)
BSC
.009 – .015
(0.229 – 0.381)
.300 – .325
(7.620 – 8.255)
.325 +.035
–.015
+0.889
–0.381
8.255
()
NOTE:
1. DIMENSIONS ARE INCHES
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
LTC221/LTC222
11
2212fa
U
PACKAGE DESCRIPTIO
.016 – .050
(0.406 – 1.270)
.010 – .020
(0.254 – 0.508)× 45°
0° – 8° TYP
.008 – .010
(0.203 – 0.254)
1
N
2345678
N/2
.150 – .157
(3.810 – 3.988)
NOTE 3
16 15 14 13
.386 – .394
(9.804 – 10.008)
NOTE 3
.228 – .244
(5.791 – 6.197)
12 11 10 9
S16 0502
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
TYP
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
.245
MIN
N
123 N/2
.160 ±.005
RECOMMENDED SOLDER PAD LAYOUT
.045 ±.005
.050 BSC
.030 ±.005
TYP
INCHES
(MILLIMETERS)
NOTE:
1. DIMENSIONS IN
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
S Package
16-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
LTC221/LTC222
12
2212fa
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LTC201/LTC202/LTC203 Micropower, Low Charge Injection, Quad CMOS Analog Switches DG201/DG202 Compatible
LTC1380/LTC1393 8-Channel/4-Channel Analog Multiplexer with SMBus Interface 3V to ±15V, 8 Single Ended/4 Differential Inputs
LTC1390/LTC1391 8-Channel, Analog Multiplexer with Serial Interface 3V to ±15V Operation
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
LW/TP 1002 1K REV A • PRINTED IN USA
LINE AR TECHN O LOGY CO RPORATIO N 1991
