TDA8705 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
TDA8705
FEATURES
• 2 times 6-bit resolution
• Sampling rate up to 40 MHz
• High signal-to-noise ratio over a large analog input
frequency range (5.8 effective bits at 10 MHz full-scale
input at f_clk = 40 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 TDA8705 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
40 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
analog supply voltage
4.75
V_CCD
digital supply voltage
4.75
V_CCO
output stages supply voltage
4.75
I_CCA
analog supply current
20
I_CCD
digital supply current
10
I_CCO
output stages supply current
10
ILE
DC integral linear error
−
DLE
DC differential linearity error
−
AILE
AC integral linearity error
note 1
−
f_clk(max)
maximum clock frequency
40
P_tot
total power dissipation
−
Note
1. Full-scale sine wave (f_i = 10 MHz; f_clk = 40 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
TDA8705T
NAME
SO28
PACKAGE
DESCRIPTION
plastic small outline package; 28 leads; body width 7.5 mm
VERSION
SOT136-1
1996 Jan 12
2