TQ6122-M Ver la hoja de datos (PDF) - TriQuint Semiconductor

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TQ6122-M

1 Gigasample/sec, 8-bit Digital-to-Analog Converter

TriQuint Semiconductor 

TQ6122

Figure 3. Typical Digital Input Circuit (Including CLOCK Inputs)

MICROSTRIP

INPUT

R

DAC

IN,

C IN

50

50

50

V TT

–2 V

INPUT PROTECTION

NETWORK

500

TO INPUT

BUFFER

500

VSS

–5 V

Figure 4. VOUT, VOUT, and Input Code Relationships for (A) Typical Instrumentation and (B) Video Configurations

(A) TQ6122 Instrumentation DAC operation (1 V Full-Scale)

Blanking current is shunted to ground by tying BLANK DISABLE to AGND and forcing BLANK = 0.

Full Scale

Full Scale – 1 LSB

Half Scale + 1 LSB

Half Scale

Half Scale –1 LSB

Zero Scale + 1 LSB

Zero Scale

Input Code

11111111

11111110

10000001

10000000

01111111

00000001

00000000

VOUT (1)

–0.996 V

–0.992 V

–0.504 V

–0.500 V

–0.496 V

–0.004 V

␣ 0.000 V

VOUT (1)

␣ 0.000 V

–0.004 V

–0.492 V

–0.496 V

–0.500 V

–0.992 V

–0.996 V

(B) TQ6122 Video DAC Operation (0.679 V Full-Scale)

Blanking current is enabled by connecting BLANK DISABLE to VAA.

Input Code

VOUT (1)

Full Scale

11111111

–0.679 V

Full Scale – 1 LSB

11111110

–0.676 V

Half Scale + 1 LSB

10000001

–0.343 V

Half Scale

10000000

–0.341 V

Half Scale – 1 LSB

01111111

–0.338 V

Zero Scale + 1 LSB

00000001

–0.003 V

Zero Scale

00000000

␣ 0.000 V

BLANK = HIGH

X.....X

–0.750 V

VOUT (1)

–0.071 V

–0.074 V

–0.407 V

–0.409 V

–0.412 V

–0.747 V

–0.750 V

␣ 0.000 V

Notes: 1. All values shown for VOUT and VOUT assume identical load resistors (RL1 and RL2 in Figure 5),

and no externally imposed output offset voltage (VOS in Figure 5). Zero-scale offset is ignored.

For additional information and latest specifications, see our website: www.triquint.com

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