TDA8761 Datasheet, PDF (2/20 Pages) NXP Semiconductors – 9-bit analog-to-digital converter for digital video

Philips Semiconductors
9-bit analog-to-digital converter for
digital video
Preliminary specification
TDA8761
FEATURES
• 9-bit resolution
• Sampling rate up to 30 MHz
• DC sampling allowed
• One clock cycle conversion only
• High signal-to-noise ratio over a large analog input
frequency range (8.5 effective bits at 10 MHz full-scale
input at f_clk = 30 MHz)
• No missing codes guaranteed
• In range (IR) 3-state TTL output
• TTL compatible digital inputs and outputs
• Low-level AC clock input signal allowed
• External reference voltage regulator
• Power dissipation only 360 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 TDA8761 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
30 MHz. Its linearity performance ensures the required
conversion accuracy in case of 256QAM demodulator
concept and for all symbol frequencies. All digital inputs
and outputs are TTL compatible, although a low-level sine
wave clock input signal is allowed.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNIT
V_CCA
V_CCD
V_CCO
I_CCA
I_CCD
I_CCO
AINL
ADNL
f_clk(max)
P_tot
analog supply voltage
4.75
digital supply voltage
4.75
output stages supply voltage
4.4
analog supply current
−
digital supply current
−
output stages supply current
−
AC integral non-linearity
note 1; full scale input sine wave
−
note 1; 50% full scale input sine wave −
AC differential non-linearity note 1; full scale input sine wave
−
note 1; 50% full scale input sine wave −
maximum clock frequency
30
total power dissipation
−
5.0 5.25
5.0 5.25
5.0 5.25
30
tbf
22
tbf
22
tbf
±0.75 tbf
±0.5 tbf
±0.5 tbf
±0.3 tbf
−
−
360 tbf
V
V
V
mA
mA
mA
LSB
LSB
LSB
LSB
MHz
mW
Note
1. f_i = 11 MHz and f_clk = 30 MHz; f_i = 8 MHz and f_clk = 20 MHz.
ORDERING INFORMATION
TYPE
NUMBER
TDA8761M
NAME
SSOP28
PACKAGE
DESCRIPTION
plastic shrink small outline package; 28 leads; body width 5.3 mm
VERSION
SOT341-1
1995 Mar 20
2