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PDF LTC222 Data sheet ( Hoja de datos )
| Número de pieza | LTC222 | |
| Descripción | (LTC221 / LTC222) Micropower | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC221/LTC222
Micropower, Low Charge
Injection, Quad CMOS Analog
Switches with Data Latches
FEATURES
DESCRIPTIO
■ Micropower Operation
The LTC®221 and LTC222 are micropower, quad CMOS
■ Single 5V or ±15V Supply Operation
analog switches which typically dissipate only 250µW
■ Low Charge Injection
from ±15V supplies and 40µW from a single 5V supply.
■ Low RON
■ Low Leakage
Onboard latches allow the LTC221 and LTC222 to inter-
face directly to most microprocessor buses. The switches
■ Guaranteed Break Before Make
have 65Ω typical on resistance and a very high off resis-
■ Latch Resistant Design
tance. A break before make characteristic is inherent in
■ TLL/CMOS Compatible
these switches to prevent the shorting of two channels.
■ Improved Second Source for DG221/DG222
The signal range is ±15V with a supply voltage of ±15V and
■ Microprocessor Bus Compatible
0V to 5V with a single 5V supply. The switches have special
U
KEY SPECIFICATIO S
charge compensation circuitry which greatly reduces
charge injection to a maximum of ±25pC (±15V supplies).
The LTC221 and LTC222 are designed for applications
■ Supply Current ..................... I+ = 40µA, I– = 5µA Max such as microprocessor controlled programmable gain
■ Charge Injection
amplifiers, automatic test equipment, communication DataShee
±Si1n5gVleS5uVppSluiepspl.y...............................................................±..2. 52pDpCCaMtTaaySxpheet4snUyos.rctmeomamllsy,
and data acquisition systems. The LTC221 is
closed and the LTC222 is normally open as
■ RON ............................................................... 65ΩTyp shown in the Logic Table.
■ Signal Range ..................................................... ±15V
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATIO
Two-Channel, 12-Bit, Self Calibrating Data Acquisition System
V+
5V
GND
LTC221/LTC222
WR
IN4
IN3
V– IN2
IN1
VFS S1
S2
VIN
OV TO 5V
S3
S4
D1
D2
D3
D4
DataSheet4U.com
LOGIC
DECODER
ADDRESS BUS
DATA BUS B0 – B3
15V
+
LT1006
–
10k IN
150k
–15V
120Ω
–IN
GND
5V
LTC1292 CLK
12-BIT
ADC
DOUT
CS
R1 VREF
SERIAL PORT
100k
270Ω
LT1027
VFS
WR
TO MICROPROCESSOR
e.g. TMS320C25
15V
LTC221/222 • TA01
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LTC221/LTC222
APPLICATIO S I FOR ATIO
Switching Time Test Circuit
Switch output waveform shown for VS = constant with
logic input waveform as shown. Note that VS may be (+)
or (–) as per switching time test circuit. VO is the steady
state output switch on. Feedthrough via gate capacitance
may result in spikes at leading and trailing edge of output
waveform.
LTC222
LOGIC INPUT
tr < 20ns
tr < 20ns
3V
OV
LTC221
LOGIC INPUT
tr < 20ns
tr < 20ns
SWITCH
INPUT
3V
OV
VS
SWITCH
OUTPUT
OV
LOGIC "1" = SW ON
50%
LOGIC "0" = SW ON
50%
Switching Time Test Circuit
SWITCH
INPUT S1
VS = 2V
IN1
LOGIC
INPUT
VO 0.9
tON
VO 0.9
tOFF
LTC221/222 • AI01
SWITCH
D1 OUTPUT
VO
RL
1k
CL
35pF
VO
=
VS
RL+
RL
RDS(ON)
(REPEAT TEST FOR IN2, IN3 AND IN4)
LTC221/222 • AI02
et4U.com
RGEN
VGEN
SX
DX
INX
Charge Injection Test Circuit
VO DataSheet4U.com
CL = 1000pF
∆VO
VO
LTC221/222 • AI03
3V
LTC221 INX
OV
ON
OFF
ON
3V
LTC222 INX
OV
ON
OFF
ON
∆VO IS THE MEASURED VOLTAGE ERROR DUE TO CHARGE INJECTION.
THE ERROR VOLTAGE IN COULOMBS IS ∆Q = VL • ∆VO
LTC221/222 • AI04
DataShee
OIRR-Off Isolation Test Circuit
C 15V
SIGNAL
GENERATOR
VS = 2VP-P
f = 100kHz
CHAN A
ANALYZER
CHAN B
RL
1k
VS V+
INX
VD
GND
V–
VIN
C = 0.001µF//0.1µF
CHIP CAPACITORS
DataSheet4U.com
OIRR = 20 LOG
VS
VD
C
–15V
LTC221/222 • AI05
CCRR-Channel to Channel Crosstalk Test Circuit
C 15V
SIGNAL
GENERATOR
VS = 2Vp-p
f = 100kHz
CHAN A
ANALYZER
CHAN B
VIN
RL
1k
VS1 V+
VL VD1
IN1
VD2
GND
IN2
VS2
V–
50Ω
VIN
NC
C = 0.001µF//0.1µF
CHIP CAPACITORS
OIRR = 20 LOG
VS1
VD2
C
–15V
LTC221/222 • AI06
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LTC221/LTC222
PACKAGE DESCRIPTIO
S Package
16-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.050 BSC
N
.045 ±.005
.245
MIN .160 ±.005
12 3
N/2
.030 ±.005
TYP RECOMMENDED SOLDER PAD LAYOUT
.010
(0.254
–
–
.020
0.508)
×
45°
.008 – .010
(0.203 – 0.254)
0° – 8° TYP
.386 – .394
(9.804 – 10.008)
NOTE 3
16 15 14 13 12 11 10 9
.228 – .244
(5.791 – 6.197)
N
.150 – .157
(3.810 – 3.988)
NOTE 3
N/2
1 2 34 5 6 7 8
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
et4U.com
.016 – .050
(0.406 – 1.270)
NOTE:
1. DIMENSIONS
IN
INCHES
(MILLIMETERS)
.014 – .019
(0.355 – 0.483)
TYP
DataSheet4U.com
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)
.050
(1.270)
BSC
S16 0502
DataShee
DataSheet4U.com
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.
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| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC222.PDF ] | |
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