AS1504-T 查看數據表（PDF） - austriamicrosystems AG

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AS1504-T

Octal 8-Bit Programmable Low-Power DACs with Shutdown and Mid-Scale Reset

austriamicrosystems AG 

AS1504, AS1505

Data Sheet

austriamicrosystems

8 Detailed Description

The AS1504/AS1505 contain eight DAC channels of programmable voltage output adjustment capability. OUTx can be

individually changed in random sequence. The fast serial-data loading (33MHz) allows all eight DACs to be quickly

loaded (3ms typ; 12 x 8 x 30ns).

Figure 11. Detailed Block Diagram

CSN

CLK

GND

SDI

D10

D9

D8

D7

D6

D5

D

D4

D3

D2

D1

D0

Serial

Register

EN

Address

Decode

8

D7

D6

D5

D4 DAC1

D3 Register

D2

8

D1

D0 R

DAC1

D7

D6

D5

D4 DAC8

D3 Register

D2

8

D1

D0 R

DAC1

VREFH

OUT1

OUT8

SHDNN

RSN

AS1504 Only

AS1504/

AS1505

VREFL

AS1505 Only

Each output voltage can be programmed by clocking an 11-bit serial data word into pin SDI (see Figure 12). The format

of this data word is three address bits (MSB first, followed by eight data bits (see Table 5)).

To determine which of the DAC registers is to receive the serial register data (bits B7:B0) the DACx address is

decoded as:

DACx = A2 x 4 + A1 x 2 + A0 + 1

(EQ 1)

Figure 12. Timing Diagram

1

SDI

0

A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 DO

1

CLK

0

1

CSN

0

VOUT +5V

0V

DAC Register Load

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