LTC6915IDE 查看數據表（PDF） - Linear Technology

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LTC6915IDE

Zero Drift, Precision Instrumentation Amplifier with Digitally Programmable Gain

Linear Technology 

LTC6915

Operation

DOUT is always active in serial mode (never tri-stated).

This simplifies the daisy chaining of the multiple devices.

DOUT cannot be “wire-or” to other SPI outputs. In addition,

DOUT does not return to zero at the end of transmission,

i.e. when CS is pulled high.

A LTC6915 may be daisy-chained with other LTC6915s

or other devices having serial interfaces by connecting

the DOUT to the DIN of the next chip while CLK and CS

remain common to all chips in the daisy chain. The serial

data is clocked to all the chips then the CS signal is pulled

high to update all of them simultaneously. Figure 4

shows an example of two LTC6915s in a daisy chained SPI

configuration.

5V

5V

LTC6915

1

SHDN

V+ 16

0.1µF

2 IN–

15

OUT

VOUT

VIN

3 IN+

14

SENSE

4 V–

13

REF

5

12

HOLD_THRU NC

6

CS(D0)

11

P/S

7

DIN(D1)

10

DGND

8

9

CLK(D2) DOUT(D3)

VIN

D0

µP D1

D2

D3

1

LTC6915

SHDN

V+ 16

2

IN–

15

OUT

3

IN+

14

SENSE

4

V–

13

REF

5

12

HOLD_THRU NC

6

CS(D0)

11

P/S

7

DIN(D1)

10

DGND

8

9

CLK(D2) DOUT(D3)

VOUT

10k

0.1µF

PARALLEL GAIN CONTROL CODE = 1010

VOUT = 29 VIN = 512VIN

GAIN IS SET BY MICROPROCESSOR. A 10k RESISTOR

ON DOUT(D3) PROTECT THE DEVICE WHEN VD3 > V+

6915 F01

Figure 1. PGA in the Parallel Control Mode

V+

4-BIT GAIN

CONTROL CODE

CS

4-BIT

LATCH

DOUT(D3)

DIN

Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7

8-BIT

SHIFT-REGISTER

DGND

(INTERNAL

NODE)

V–

6915 F02

Figure 2. Bidirectional Nature of DOUT/D3 Pin

DOUT

CLK

(D3)

6915 F03

Figure 3. Diagram of Serial Interface (MSB First Out)

6915fb

13

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