
June 1994
2
Philips Semiconductors
Product specication
8-bit high-speed analog-to-digital converter
TDF8704
FEATURES
8-bit resolution
Sampling rate up to 50 MHz
Extended temperature range (40 to +85 °C)
High signal-to-noise ratio over a large analog input
frequency range (7.4 effective bits at 4.43 MHz full-scale
input and at fclk = 50 MHz)
Binary 3-state TTL outputs
Overflow/underflow 3-state TTL output
TTL compatible digital inputs
Low-level AC clock input signal allowed
Stable internal reference voltage regulator included
Power dissipation only 380 mW (typical)
Low analog input capacitance, no buffer amplifier
required
No sample-and-hold circuit required.
APPLICATIONS
General purpose high-speed analog-to-digital
conversion for extended temperature applications
Automotive
RF, satellite and GPS (Global Positioning System)
Medical
General industrial
Digital video (VCR, TV and satellite).
GENERAL DESCRIPTION
The TDF8704T is an 8-bit high-speed analog-to-digital
converter (ADC) for general industrial applications. It
converts the analog input signal into 8-bit binary-coded
digital words at a maximum sampling rate of 50 MHz. All
digital inputs and outputs are TTL compatible, although a
low-level AC clock input signal is allowed.
QUICK REFERENCE DATA
Note
1. Full-scale sine wave (fi = 4.43 MHz; fclk = 50 MHz).
ORDERING INFORMATION
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
VCCA
analog supply voltage
4.75
5.0
5.25
V
VCCD
digital supply voltage
4.75
5.0
5.25
V
VCCO
output stages supply voltage
4.75
5.0
5.25
V
ICCA
analog supply current
37
46
mA
ICCD
digital supply current
23
35
mA
ICCO
output stages supply current
16
21
mA
ILE
DC integral linear error
±0.4
±1
LSB
DLE
DC differential linearity error
±0.2
±0.5
LSB
AILE
AC integral linearity error
note 1
±2
LSB
fclk(max)
maximum clock frequency
50
MHz
Ptot
total power dissipation
380
535
mW
TYPE NUMBER
PACKAGE
SAMPLING
FREQUENCY
PINS
PIN POSITION
MATERIAL
CODE
TDF8704T/2
24
SO24L
plastic
SOT137-1
20 MHz
TDF8704T/4
24
SO24L
plastic
SOT137-1
40 MHz
TDF8704T/5
24
SO24L
plastic
SOT137-1
50 MHz