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LTC1598LIG#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
22
LTC1594L/LTC1598L
15948lfb
TYPICAL APPLICATIONS N
U
Using MUXOUT/ADCIN Loop as PGA
This figure shows the LTC1598L’s MUXOUT/ADCIN pins
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 LTC1594L, 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 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
is
Using the MUXOUT/ADCIN Pins of the LTC1598L to Form a PGA.
The LTC1391 MUX Allows Eight Input Channels to be Digitized
the summation of the resistors below the selected MUX
channel. If CH0 is selected, the 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 com-
pensation for the amplifiers, help reduce the amplifiers’
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 gain given by the
formula above.
1594L/98L 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
= DAISY CHAIN CONFIGURATION FOR THE LTC1391 AND THE LTC1598L
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
3V
1µF
ADCIN
17 16 15, 19
1µF
0.1µF
3V
1µF
3V
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
LTC1598L
µP/µC
3(5)
2(6)
1(7)
4
8
23
LTC1594L/LTC1598L
15948lfb
G Package
24-Lead Plastic SSOP (0.209)
(LTC DWG # 05-08-1640)
PACKAGE DESCRIPTION
U
S Package
16-Lead Plastic Small Outline (Narrow 0.150)
(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.
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
LTC1594L/LTC1598L
15948lfb
LINEAR TECHNOLOGY CORPORATION 1997
LT/TP 0404 1K
REV B
• PRINTED IN USA
TYPICAL APPLICATION
U
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Using the LTC1598L and LTC1391 as an 8-Channel Differential 12-Bit ADC System
1594L/98L TA07
20
21
22
23
24
1
2
3
8 COM
GND
4, 9
10
6
5, 14
7
11
CSADC
CSMUX
CLK
D
IN
D
OUT
12
13
NC
NC
ADCINMUXOUT
18 17 16 15, 19
1µF
1µF
3V
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
3V
LTC1598L
= DAISY CHAIN CONFIGURATION FOR THE LTC1391 AND THE LTC1598L
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
+
–
12-BIT
SAMPLING
ADC
8-CHANNEL
MUX
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
V
+
D
V
–
D
OUT
D
IN
CS
CLK
GND
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear-tech.com
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LTC1598LIG#TRPBF

Mfr. #:
Buy LTC1598LIG#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 12-Bit 8/Ch Low Pwr ADC 3V
Lifecycle:
New from this manufacturer.
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