LTC2620CUFD View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC2620CUFD

Octal 16-/14-/12-Bit Rail-to-Rail DACs in 16-Lead SSOP

Linear Technology 

LTC2600/LTC2610/LTC2620

OPERATION

INPUT WORD (LTC2600)

COMMAND

ADDRESS

DATA (16 BITS)

C3 C2 C1 C0 A3 A2 A1 A0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

MSB

INPUT WORD (LTC2610)

LSB

2600 TBL01

COMMAND

ADDRESS

DATA (14 BITS + 2 DON’T-CARE BITS)

C3 C2 C1 C0 A3 A2 A1 A0 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 X X

MSB

INPUT WORD (LTC2620)

LSB

2600 TBL02

COMMAND

ADDRESS

DATA (12 BITS + 4 DON’T-CARE BITS)

C3 C2 C1 C0 A3 A2 A1 A0 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 X X X X

MSB

LSB

2600 TBL03

32-bit sequence. The 32-bit word is required for daisy-

chain operation, and is also available to accommodate

microprocessors which have a minimum word width of

16 bits (2 bytes).

Daisychain Operation

The serial output of the shift register appears at the SDO

pin. Data transferred to the device from the SDI input is

delayed 32 SCK rising edges before being output at the

next SCK falling edge.

The SDO output can be used to facilitate control of multiple

serial devices from a single 3-wire serial port (i.e., SCK,

SDI and CS/LD). Such a “daisychain” series is configured

by connecting SDO of each upstream device to SDI of the

next device in the chain. The shift registers of the devices

are thus connected in series, effectively forming a single

input shift register which extends through the entire

chain. Because of this, the devices can be addressed and

controlled individually by simply concatenating their input

words; the first instruction addresses the last device in

the chain and so forth. The SCK and CS/LD signals are

common to all devices in the series.

In use, CS/LD is first taken low. Then the concatenated

input data is transferred to the chain, using SDI of the

first device as the data input. When the data transfer is

complete, CS/LD is taken high, completing the instruction

sequence for all devices simultaneously. A single device

can be controlled by using the no-operation command

(1111) for the other devices in the chain.

2600fe

13

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