TDA8761A Datasheet, PDF (2/24 Pages) NXP Semiconductors – 9-bit analog-to-digital converter for digital video

Philips Semiconductors
9-bit analog-to-digital converter
for digital video
Product specification
TDA8761A
FEATURES
• 9-bit resolution
• Sampling rate up to 40 MHz
• DC sampling allowed
• One clock cycle conversion only
• High signal-to-noise ratio over a large analog input
frequency range (8.2 effective bits at 10 MHz full-scale
input at f_clk = 30 MHz)
• No missing codes guaranteed
• In Range (IR) CMOS output
• Levels TTL and CMOS compatible digital inputs
• 3 to 5 V CMOS digital outputs
• Low-level AC clock input signal allowed
• External reference voltage regulator
• Power dissipation only 158 mW (typical)
• Low analog input capacitance, no buffer amplifier
required
• No sample-and-hold circuit required.
APPLICATIONS
Analog-to-digital conversion for:
• Video data digitizing
• Digital Video Broadcasting (DVB)
• Cable TV.
GENERAL DESCRIPTION
The TDA8761A is a 9-bit Analog-to-Digital Converter
(ADC) for professional video and digital video set box
applications. It converts the analog input signal into 9-bit
binary-coded digital words at a maximum sampling rate of
40 MHz. Its linearity performance ensures the required
conversion accuracy in the event of 256-QAM
demodulator concept and for all symbol frequencies.
All digital inputs and outputs are TTL and CMOS
compatible, although a low-level sine wave clock input
signal is allowed.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
V_CCA
V_CCD
V_CCO
I_CCA
I_CCD
I_CCO
INL
AINL
DNL
ADNL
f_clk(max)
P_tot
analog supply voltage
digital supply voltage
output stages supply voltage
analog supply current
digital supply current
output stages supply current
integral non-linearity
AC integral non-linearity
differential non-linearity
AC differential non-linearity
maximum clock frequency
total power dissipation
f_clk = 30 MHz; ramp input
f_clk = 30 MHz; ramp input
full-scale input sine wave; note 1
50% full-scale input sine wave; note 1
f_clk = 30 MHz; ramp input
full-scale input sine wave; note 1
50% full-scale input sine wave; note 1
Note
1. f_i = 10 MHz and f_clk = 30 MHz; f_i = 8 MHz and f_clk = 20 MHz.
MIN.
4.75
4.75
3.0
−
−
−
−
−
−
−
−
−
40
−
TYP.
5.0
5.0
3.3
18
13
1
±0.8
±0.75
±0.5
±0.3
±0.5
±0.3
−
158
MAX.
5.25
5.25
5.25
24
18
2
±1.6
0.9
±0.75
±0.7
±0.75
±0.5
−
173
UNIT
V
V
V
mA
mA
mA
LSB
LSB
LSB
LSB
LSB
LSB
MHz
mW
1998 Nov 03
2