LTC6915

13

6915f

SHDN

HOLD_THRU

CS(D0)

CLK(D2)

OUT

SENSE

REF

NC

P/S

DGND

LTC6915

#2

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

0.1

µF

SHDN

HOLD_THRU

CS(D0)

CLK(D2)

OUT

SENSE

REF

NC

P/S

DGND

LTC6915

#1

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

0.1

µF

0.1

µF

0.1

µF

0.1

µF

µP

–5V

–5V

–5V

0.1

µF

–5V

6915 F04

CS

CLK

CLK

CS/LD

D15

D11

D10

D9

D8

D7

D3

D2

D1

D0

GAIN CODE FOR #2

GAIN CODE FOR #1

Figure 4. 2 PGAs in a Daisy Chain

OPERATIO

The amplifier’s gain is set as follows:

D3, D2, D1, D0

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101~

1111

Gain

01248

16

32

64

128

256

512

1024

2048

4096

Input Voltage Range

The input common mode voltage range of the LTC6915 is

rail-to-rail. However, the following equation limits the size

of the differential input voltage:

voltages, i.e.,

±5 Volt Operation

When using the LTC6915 with supplies over 5.5V, care

must be taken to limit the maximum difference between

i.e.,

If not, the device will be damaged. For example, if rail-to-

rail input operation is desired when the supplies are at

±5V,

the REF pin should be 0,

±0.5V.Asasecondexample,ifthe

should not exceed 5.5V.