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LTC1594CS#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
22
LTC1594/LTC1598
15948fb
TYPICAL APPLICATIONS N
U
Using MUXOUT/ADCIN Loop as PGA
This figure shows the LTC1598’s MUXOUT/ADCIN loop
and an LT1368 being used to create a single channel PGA
with eight noninverting gains. Combined with the LTC1391,
the system can expand to eight channels and eight gains
for each channel. Using the LTC1594, the PGA is reduced
to four gains. The output of the LT1368 drives the ADCIN
and the resistor ladder. The resistors above the selected
MUX channel form the feedback for the LT1368. The loop
gain for this amplifier is R
S1
/R
S2
+ 1. R
S1
is the summation
of the resistors above the selected MUX channel and R
S2
Using the MUXOUT/ADCIN Loop of the LTC1598 to Form a PGA with Eight Gains in a Noninverting Configuration
is the summation of the resistors below the selected MUX
channel. If CH0 is selected, the loop gain is 1 since R
S1
is
0. Table 1 shows the gain for each MUX channel. The
LT1368 dual rail-to-rail op amp is designed to operate with
0.1μF load capacitors. These capacitors provide frequency
compensation for the amplifiers, help reduce the amplifi-
ers’ output impedance and improve supply rejection at
high frequencies. Because the LT1368’s I
B
is low, the R
ON
of the selected channel will not affect the loop gain given
by the formula above.
1594/98 TA06
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
20
21
22
23
24
1
2
3
64R
32R
16R
8R
4R
2R
R
R
+
–
8 COM
18 MUXOUT
GND
4, 9
10
6
5, 14
11
7
CSADC
CSMUX
CLK
D
OUT
D
IN
12
13
NC
NC
12-BIT
SAMPLING
ADC
8-CHANNEL
MUX
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
LTC1391
5V
1 F
ADCIN
17 16 15, 19
1 F
0.1 F
5V
1 F
5V
V
REF
V
CC
–
+
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
V
+
D
V
–
D
OUT
D
IN
CS
CLK
GND
1/2 LT1368
LTC1598
P/ C
23
LTC1594/LTC1598
15948fb
PACKAGE DESCRIPTION
U
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.
G Package
24-Lead Plastic SSOP (5.3mm)
(Reference LTC DWG # 05-08-1640)
S Package
16-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
G24 SSOP 0204
0.09 – 0.25
(.0035 – .010)
0° – 8°
0.55 – 0.95
(.022 – .037)
5.00 – 5.60**
(.197 – .221)
7.40 – 8.20
(.291 – .323)
1234
5
6
7
8 9 10 11 12
7.90 – 8.50*
(.311 – .335)
2122 18 17 16 15 14
13
19202324
2.0
(.079)
MAX
0.05
(.002)
MIN
0.65
(.0256)
BSC
0.22 – 0.38
(.009 – .015)
TYP
MILLIMETERS
(INCHES)
DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED .152mm (.006") PER SIDE
DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED .254mm (.010") PER SIDE
*
**
NOTE:
1. CONTROLLING DIMENSION: MILLIMETERS
2. DIMENSIONS ARE IN
3. DRAWING NOT TO SCALE
0.42 ±0.03 0.65 BSC
5.3 – 5.7
7.8 – 8.2
RECOMMENDED SOLDER PAD LAYOUT
1.25 ±0.12
.016 – .050
(0.406 – 1.270)
.010 – .020
(0.254 – 0.508)
× 45°
0° – 8° TYP
.008 – .010
(0.203 – 0.254)
1
N
2
3
4
5
6
7
8
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
1 2 3 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)
24
LTC1594/LTC1598
15948fb
© LINEAR TECHNOLOGY CORPORATION 1996
LT 0507 REV B • PRINTED IN USA
TYPICAL APPLICATION
U
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PART NUMBER DESCRIPTION COMMENTS
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REF
, CLK, Sample-and-Hold
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Using the LTC1598 and LTC1391 as an 8-Channel Differential 12-Bit ADC System
1594/98 TA07
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
20
21
22
23
24
1
2
3
+
–
8-CHANNEL
MUX
8 COM
GND
4, 9
10
6
5, 14
7
11
CSADC
CSMUX
CLK
D
IN
D
OUT
12
13
NC
NC
12-BIT
SAMPLING
ADC
ADCINMUXOUT
18 17 16 15, 19
1μF
1μF
5V
V
REF
V
CC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
LTC1391
CH0
CH7
D
IN
CLK
CS
D
OUT
5V
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
V
+
D
V
–
D
OUT
D
IN
CS
CLK
GND
LTC1598
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
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LTC1594CS#TRPBF

Mfr. #:
Buy LTC1594CS#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 12-bit, 4-channel16.8ksps SAR ADC
Lifecycle:
New from this manufacturer.
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