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DAC-12100

12-Bit, 100MHz, Low-Power D/A Converters

26 Jun 2015 MDA_DAC-12100.B03 Page 4 of 7

POWER SUPPLIES

REFERENCE

In order to reduce power supply noise separate –5.2V analog and digital

power supplies should be used. The power supply lines should be

bypassed with 0.1μF and 0.01μF ceramic capacitors placed as close to the

–5.2V analog pins (15, 25) and digital pins (12, 21) as possible. The analog

and digital power supply ground returns should be connected at one point

as close to the power source as possible. The +5V supply pin (23) should

be bypassed with a 0.1μF ceramic capacitor connected as close to the pin

as possible. See Figure 2.

Figure 2. Typical Connection Diagram

The internal reference is a –1.23V, typical, bandgap voltage reference. The

internal reference is connected to Reference OUT (REF OUT, pin 20) and the

internal control Amplifier (CTRL IN, pin 19). The control Amplifier OUT (CTRL

OUT, pin 18) should be connected to Reference IN (REF IN, pin17) and to

–5.2V (pin 15) Analog Supply through a 0.1μF and a 0.01uF ceramic capac-

itor (as shown in figure 2) in order to improve the settling time This reduces

switching noise and improves output settling time. The Full Scale Output

The internal reference (REF OUT) may be overdriven with a more precise

external reference, capable of delivering up to 2mA, to provide better over

temperature performance.

(17) REF IN

(18) CTRL OUT

(20) REF OUT

(28)

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

(11)

(13) AGND

(15, 25) –5.2 V (A)

–5.2 V (D) (12, 21)

DATA CLOCK (26)

DGND (27)

BIT 1 (MSB)

BIT 2

BIT 3

BIT 4

BIT 5

BIT 6

BIT 7

BIT 8

BIT 9

BIT 10

BIT 11

BIT 12 (LSB)

+5V (D) (23)

+5V (D)

DAC-12100

–5.2V (A)

D/A OUT

976

-5.2V (A)

–5.2V (D)

Ω

Ω

Ω

0.1μF

0.01μF

0.1μF

0.01μF

0.01μF

0.1μF

50

Ω

(24)

0.1μF

50

50

(19) CTRL IN

REF GND

(22)