TDA8785 Datasheet, PDF (2/24 Pages) NXP Semiconductors – 8-bit high-speed analog-to-digital converter with gain and offset controls

Philips Semiconductors
8-bit high-speed analog-to-digital converter
with gain and offset controls
Product specification
TDA8785
FEATURES
• 8-bit analog-to-digital converter (ADC)
• 8-bit digital-to-analog converter (DAC)
• Sampling rate up to 30 Msps for both ADC and DAC
• Binary or two’s complement 3-state TTL outputs
• TTL compatible inputs and outputs
• 100 MHz variable gain amplifier (0 to 20 dB) externally
controlled
• All analog inputs and outputs are differential (can also
be used in single-ended format)
• Analog input signal from 0.1 to 1.0 V (p-p) differential
• Offset amplifier with:
– Slow offset control (±250 mV)
– Fast offset control (±500 mV) eventually driven by
internal DAC.
• ADC output code of 8 (typ.) when analog input signal
and offset correction inputs are 0 V
• Gain, slow offset control inputs and DAC output swing
of 1.5 V (p-p) range (2.75 ±0.75 V)
• 2.75 V reference voltage
• Internal references for ADC and DAC.
APPLICATIONS
• CCD type of systems
• Scanner
• Copier
• Video acquisition.
GENERAL DESCRIPTION
The TDA8785 is an 8-bit analog-to-digital converter with
gain and offset controls for the input signal. An internal
8-bit DAC provides fast offsets control.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
V_CCA1
V_CCA2
V_CCD
V_CCO
I_CCA
I_CCD
I_CCO
INL
analog supply voltage 1
analog supply voltage 2
digital supply voltage
TTL output supply voltage
analog supply current
digital supply current
TTL output supply current
integral non-linearity
DNL
differential non-linearity
f_clk(max)
B
maximum clock frequency
controlled gain amplifier
bandwidth
P_tot
total power dissipation
CONDITIONS
0 to 20 dB gain; ramp input
0 to 20 dB gain; ramp input
ADC and DAC
MIN.
4.75
4.75
4.75
4.75
−
−
−
−
−
30
−
TYP.
5.0
5.0
5.0
5.0
80
30
9
±0.7
±0.2
−
100
MAX.
5.25
5.25
5.25
5.25
−
−
−
±1.8
±0.7
−
−
UNIT
V
V
V
V
mA
mA
mA
LSB
LSB
MHz
MHz
−
600
−
mW
ORDERING INFORMATION
TYPE
NUMBER _NAME
PACKAGE
DESCRIPTION
VERSION
TDA8785H QFP44 plastic quad flat package; 44 leads (lead length 1.3 mm); body 10 × 10 × 1.75 mm SOT307-2
1997 Dec 18
2