Datasheet

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SLAS235B − JULY 1999 − REVISED APRIL 2004

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APPLICATION INFORMATION

data format

The 16-bit data word for the TLV5624 consists of two parts:

D Program bits (D15..D12)

D New data (D11..D0)

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

R1 SPD PWR R0 8 Data bits 0 0 0 0

SPD: Speed control bit 1 → fast mode 0 → slow mode

PWR: Power control bit 1 → power down 0 → normal operation

The following table lists the possible combination of the register select bits:

R1 R0 REGISTER

0 0 Write data to DAC

0 1 Reserved

1 0 Reserved

1 1 Write data to control register

The meaning of the 12 data bits depends on the selected register. For the DAC register, bits D11...D4 determine

the new DAC output value:

data bits: DAC

D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

New DAC Value 0 0 0 0

If the control register is selected, then D1, D0 of the 12 data bits are used to program the reference voltage:

data bits: CONTROL

D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

X X X X X X X X X X REF1 REF2

X: don’t care

REF1 and REF0 determine the reference source and, if internal reference is selected, the reference voltage.

reference bits

REF1 REF0 REFERENCE

0 0 External

0 1 1.024 V

1 0 2.048 V

1 1 External

NOTE: A 0.1µF bypass capacitor must be installed on

the reference pin (pin 6). If internal reference is used a

10 µF capacitor must also be installed for reference

voltage stability.

CAUTION:

If external reference voltage is applied to the REF pin, external reference MUST be selected.