TDA8785 View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

TDA8785

8-bit high-speed analog-to-digital converter with gain and offset controls

Philips Electronics 

Philips Semiconductors

8-bit high-speed analog-to-digital converter

with gain and offset controls

Product specification

TDA8785

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP. MAX. UNIT

Slow offset amplifier inputs (pins VSOFF(p) and VSOFF(n)) gain amplifier at 0 dB; note 1

Voffset(ADC) offset voltage at ADC input

Ii

input current

VSOFF(p) = 2 V;

−

VSOFF(n) = 2.75 V

VSOFF(p) = 2.75 V;

−

VSOFF(n) = 2.75 V

VSOFF(p) = 3.5 V;

−

VSOFF(n) = 2.75 V

−

−0.25

0

0.25

10

Offset reference code; Tamb = 25 °C

OFSRE offset reference (ADC output code) Vi(p) = Vi(n);

−

8

OFSER offset reference error on code 8

VFOFF(p) = VFOFF(n);

−15

0

VSOFF(p) = VSOFF(n);

amplifier gain set at

0 dB

−

V

−

V

−

V

−

µA

−

code

+15 code

Gain control inputs (pins VFSAD(p) and VFSAD(n)); see Fig.7

Gv(min)

Gv(max)

Ii

minimum voltage gain

maximum voltage gain

input current

VFSAD(p) = 2 V;

−

−

0

dB

VFSAD(n) = 2.75 V

VFSAD(p) = 3.5 V;

20

−

VFSAD(n) = 2.75 V

−

dB

−

10

−

µA

DAC full-scale control inputs (pins VFSDAC(p) and VFSDAC(n)) 150 Ω output load on pins VDACO(p) and VDACO(n);

see Table 3

VDACO(n)

Ii

DAC negative output voltage (pin 8) code 0 at DAC inputs −

code 255 at DAC inputs; −

VFSDAC(p) = 2 V;

VFSDAC(n) = 2.75 V

code 255 at DAC inputs; −

VFSDAC(p) = 2.75 V;

VFSDAC(n) = 2.75 V

code 255 at DAC inputs; −

VFSDAC(p) = 3.5 V;

VFSDAC(n) = 2.75 V

input current

−

VCCA

−

V

VCCA − 0.4 −

V

VCCA − 0.5 −

V

VCCA − 0.6 −

V

1

−

µA

Bandwidth adjustment node input (pin B); see Fig.6

Zi

input impedance

−

500

−

Ω

8-bit DAC; fclk = 30 MHz, ramp input; Tamb = 25 °C

Zo

output impedance

INL

integral non-linearity

−

150

−

Ω

−

±0.4

±0.8 LSB

DNL

differential non-linearity

−

±0.4

±1.0 LSB

1997 Dec 18

9

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