INTEGRATED CIRCUITS
DATA SHEET
TDF8704
8-bit high-speed analog-to-digital
converter
Product specification
Supersedes data of April 1993
File under Integrated Circuits, IC02
June 1994
Philips Semiconductors
Philips Semiconductors
Product specification
8-bit high-speed analog-to-digital converter
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 f
clk
= 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.
QUICK REFERENCE DATA
SYMBOL
V
CCA
V
CCD
V
CCO
I
CCA
I
CCD
I
CCO
ILE
DLE
AILE
f
clk(max)
P
tot
Note
1. Full-scale sine wave (f
i
= 4.43 MHz; f
clk
= 50 MHz).
ORDERING INFORMATION
PACKAGE
TYPE NUMBER
PINS
TDF8704T/2
TDF8704T/4
TDF8704T/5
June 1994
24
24
24
PIN POSITION
SO24L
SO24L
SO24L
2
MATERIAL
plastic
plastic
plastic
CODE
SOT137-1
SOT137-1
SOT137-1
PARAMETER
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
CONDITIONS
MIN.
4.75
4.75
4.75
−
−
−
−
−
−
50
−
TYP.
5.0
5.0
5.0
37
23
16
±0.4
±0.2
−
−
380
APPLICATIONS
TDF8704
•
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.
MAX.
5.25
5.25
5.25
46
35
21
±1
±0.5
±2
−
535
V
V
V
UNIT
mA
mA
mA
LSB
LSB
LSB
MHz
mW
SAMPLING
FREQUENCY
20 MHz
40 MHz
50 MHz
Philips Semiconductors
Product specification
8-bit high-speed analog-to-digital converter
BLOCK DIAGRAM
TDF8704
handbook, full pagewidth
V CCA
7
CLK
16
VCCD
18
CE
22
STABILIZER
CLOCK DRIVER
DEC 5
VRT 9
TDF8704
12 D7
13 D6
14 D5
MSB
analog
voltage input
VI 8
15 D4
ANALOG - TO - DIGITAL
CONVERTER
LATCHES
TTL OUTPUTS
23 D3
24 D2
1 D1
2 D0
LSB
VCCO1
V
CCO2
overflow / underflow
output
data outputs
VRB 4
19
21
OGND 20
output ground
6
AGND
analog ground
17
DGND
OVERFLOW / UNDERFLOW
LATCH
TTL OUTPUT
11
MSA685
digital ground
Fig.1 Block diagram.
June 1994
3
Philips Semiconductors
Product specification
8-bit high-speed analog-to-digital converter
PINNING
SYMBOL
D1
D0
n.c.
V
RB
DEC
AGND
V
CCA
V
I
V
RT
n.c.
O/UF
D7
D6
D5
D4
CLK
DGND
V
CCD
V
CCO1
OGND
V
CCO2
CE
D3
D2
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
DESCRIPTION
data output; bit 1
data output; bit 0 (LSB)
not connected
reference voltage BOTTOM
(decoupling)
decoupling input (internal
stabilization loop decoupling)
analog ground
analog supply voltage (+5 V)
analog input voltage
reference voltage TOP (decoupling)
not connected
overflow/underflow data output
data output; bit 7 (MSB)
data output; bit 6
data output; bit 5
data output; bit 4
clock input
digital ground
digital supply voltage (+5 V)
supply voltage for output stages 1
(+5 V)
output ground
supply voltage for output stages 2
(+5 V)
chip enable input (TTL level input,
active LOW)
data output; bit 3
data output; bit 2
Fig.2 Pin configuration.
handbook, halfpage
TDF8704
D1
D0
n.c.
V RB
DEC
AGND
V CCA
VI
V RT
n.c.
O/UF
D7
1
2
3
4
5
6
24
23
22
21
D2
D3
CE
VCCO2
20 OGND
19
VCCO1
V CCD
DGND
CLK
D4
D5
D6
TDF8704
7
8
9
10
11
12
MSA686
18
17
16
15
14
13
June 1994
4
Philips Semiconductors
Product specification
8-bit high-speed analog-to-digital converter
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC134).
SYMBOL
V
CCA
V
CCD
V
CCO
∆V
CC
∆V
CC
∆V
CC
V
I
V
clk(p-p)
I
O
T
stg
T
amb
T
j
HANDLING
PARAMETER
analog supply voltage
digital supply voltage
output stages supply voltage
supply voltage differences between V
CCA
and V
CCD
supply voltage differences between V
CCO
and V
CCD
supply voltage differences between V
CCA
and V
CCO
input voltage
AC input voltage for switching (peak-to-peak value)
output current
storage temperature
operating ambient temperature
junction temperature
referenced to AGND
referenced to DGND
CONDITIONS
MIN.
−0.3
−0.3
−0.3
−1.0
−1.0
−1.0
−0.3
−
−
−55
−40
−
TDF8704
MAX.
+7.0
+7.0
+7.0
+1.0
+1.0
+1.0
+7.0
V
CCD
10
+150
+85
+150
UNIT
V
V
V
V
V
V
V
V
mA
°C
°C
°C
Inputs and outputs are protected against electrostatic discharges in normal handling. However, to be totally safe, it is
desirable to take normal precautions appropriate to handling integrated circuits.
THERMAL CHARACTERISTICS
SYMBOL
R
th j-a
PARAMETER
thermal resistance from junction to ambient in free air
VALUE
75
UNIT
K/W
June 1994
5
