TDA8705A Datasheet, PDF (2/16 Pages) NXP Semiconductors – 6-bit high-speed dual Analog-to-Digital Converter ADC

Philips Semiconductors
6-bit high-speed dual Analog-to-Digital
Converter (ADC)
Product specification
TDA8705A
FEATURES
• 2 times 6-bit resolution
• Sampling rate up to 80 MHz
• High signal-to-noise ratio over a large analog input
frequency range (5.5 effective bits at 20 MHz full-scale
input at f_clk = 80 MHz)
• TTL output
• Two separated inputs (AC-coupling)
• TTL compatible digital inputs
• Low-level AC clock input signal allowed
• Internal reference voltage regulator
(external reference regulation possible)
• Power dissipation only 250 mW (typical)
• Low analog input capacitance, no buffer amplifier
required
• No sample-and-hold circuit required.
APPLICATIONS
High-speed analog-to-digital conversion for:
• DBS (Digital Broadcast Satellite)
• QPSK (Quadrature Phase Shift Keying) demodulation
• Video.
GENERAL DESCRIPTION
The TDA8705A is a 6-bit high-speed dual analog-to-digital
converter (ADC) for satellite video and other applications.
It converts the two analog input signals into two 6-bit
binary-coded digital words at a maximum sampling rate of
80 MHz. 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.
V_CCA
V_CCD
V_CCO
I_CCA
I_CCD
I_CCO
ILE
DLE
AILE
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
DC integral linear error
DC differential linearity error
AC integral linearity error
maximum clock frequency
total power dissipation
note 1
4.75
4.75
4.75
20
10
10
−
−
−
80
−
Note
1. Full-scale sine wave (f_i = 20 MHz; f_clk = 80 MHz).
TYP.
5.0
5.0
5.0
27
14
14
±0.25
±0.25
±0.5
−
250
MAX.
5.25
5.25
5.25
32
18
18
±0.5
±0.5
±1.0
−
−
UNIT
V
V
V
mA
mA
mA
LSB
LSB
LSB
MHz
mW
ORDERING INFORMATION
TYPE
NUMBER
TDA8705AT
NAME
SO28
PACKAGE
DESCRIPTION
plastic small outline package; 28 leads; body width 7.5 mm
VERSION
SOT136-1
1996 Jan 12
2