LTC6915IGN datasheet(12/16 Pages) LINER

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LTC6915

6915f

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.

Figure 1. PGA in the Parallel Control Mode

SHDN

IN–

IN+

V–

HOLD_THRU

CS(D0)

DIN(D1)

CLK(D2)

V+

OUT

SENSE

REF

P/S

DGND

DOUT(D3)

LTC6915

VOUT

VIN

0.1

µF

PARALLEL GAIN CONTROL CODE = 1010

VOUT = 2

9 V

IN = 512VIN

SHDN

IN–

IN+

V–

HOLD_THRU

CS(D0)

DIN(D1)

CLK(D2)

V+

OUT

SENSE

REF

P/S

DGND

DOUT(D3)

LTC6915

VOUT

VIN

0.1

µF

GAIN IS SET BY MICROPROCESSOR. A 10k RESISTOR

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

µP

10k

6915 F01

OPERATIO

Figure 2. Bidirectional Nature of DOUT/D3 Pin

Figure 3. Diagram of Serial Interface

(MSB First Out)

V–

V+

DGND

DOUT(D3)

6915 F01

(INTERNAL

NODE)

4-BIT GAIN

CONTROL CODE

4-BIT

LATCH

Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7

8-BIT

SHIFT-REGISTER

DOUT

(D3)

CLK

DIN

6915 F02

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