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AD5601/AD5611/AD5621

Data Sheet

Rev. H | Page 18 of 21

APPLICATIONS INFORMATION

CHOOSING A REFERENCE AS POWER SUPPLY FOR

THE AD5601/AD5611/AD5621

The AD5601/AD5611/AD5621 come in tiny LFCSP and SC70

packages with less than a 100 µA supply current. Because of this,

the choice of reference depends on the application requirements.

For applications with space-saving requirements, the ADR02

is recommended. It is available in an SC70 package and has

excellent drift at 9 ppm/°C (3 ppm/°C in the R-8 package) and

provides very good noise performance at 3.4 µV p-p in the

0.1 Hz to 10 Hz range.

Because the supply current required by the AD5601/AD5611/

AD5621 is extremely low, the parts are ideal for low supply

applications. The ADR395 voltage reference is recommended in

this case. It requires less than 100 µA of quiescent current and

can, therefore, drive multiple DACs in one system, if required.

It also provides very good noise performance at 8 µV p-p in the

0.1 Hz to 10 Hz range.

Figure 51. ADR395 as Power Supply to the AD5601/AD5611/AD5621

Some recommended precision references for use as supplies to

the AD5601/AD5611/AD5621 are listed in Table 7.

Table 7. Precision References for the AD5601/AD5611/AD5621

Part No.

Initial

Accuracy

(mV max)

Temp Drift

(ppm/°C max)

0.1 Hz to 10 Hz

Noise (µV p-p typ)

ADR435

±2

3 (R-8)

ADR425

±2

3 (R-8)

3.4

ADR02

±3

3 (R-8)

ADR02

±3

3 (SC70)

ADR395

±5

9 (TSOT-23)

BIPOLAR OPERATION USING THE

AD5601/AD5611/AD5621

The AD5601/AD5611/AD5621 have been designed for single-

supply operation, but a bipolar output range is also possible

using the circuit shown in Figure 52. The circuit in Figure 52

gives an output voltage range of ±5 V. Rail-to-rail operation at

the amplifier output is achievable using an AD820 or OP295 as

the output amplifier.

Figure 52. Bipolar Operation with the AD5601/AD5611/AD5621

The output voltage for any input code can be calculated as

























































OUT

where D represents the input code in decimal (0 – 2N).

With VDD = 5 V, R1 = R2 = 10 kΩ



















OUT

This is an output voltage range of ±5 V, with 0x0000 corre-

sponding to a −5 V output and 0x3FFF corresponding to a

+5 V output.

3-WIRE

SERIAL

INTERFACE

SYNC

SCLK

SDIN

VOUT = 0V TO 5V

ADR395

AD5601/AD5611/

AD5621

R2 = 10k

Ω

+5V

–5V

AD820/

OP295

3-WIRE

SERIAL

INTERFACE

+5V

AD5601/AD5611/

AD5621

10µF

0.1µF

OUT

R1 = 10k

Ω

+5V

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