INPUT/OUTPUT CONNECTIONS
PLASTIC DIP PACKAGE
PIN FUNCTION PIN FUNCTION
1 BIT 1 (MSB) 28 MINV
2 BIT 2 27 VM
3 BIT 3 26 VB
4 BIT 4 25 ANALOG GND
5 DIGITAL GND 24 NO CONNECT
6 +5V POWER 23 ANALOG INPUT
7 –5.2V POWER 22 NO CONNECT
8 –5.2V POWER 21 ANALOG INPUT
9 –5.2V POWER 20 NO CONNECT
10 +5V POWER 19 ANALOG GND
11 DIGITAL GND 18 VT
12 LINV 17 CLOCK INPUT
13 BIT 5 16 BIT 8 (LSB)
14 BIT 6 15 BIT 7
FEATURES
• 8-bit resolution
• 20MHz conversion rate
• ±1/2LSB maximum nonlinearity
• 8MHz input bandwidth
• Low power consumption, 375mW
• TTL compatible
• Single or dual supply operation
GENERAL DESCRIPTION
Datel’s ADC-304 is an 8-bit, 20MHz analog-to-digital flash
converter. The ADC-304 offers many performance features not
obtainable from other flash A/D’s.
Key reatures include a low power dissipation of 375mW and
TTL-compatible outputs. A wide analog input bandwidth of
8MHz (–3dB) allows operation without the need of a sample-
hold. Also, single +5V supply operation is obtainable with an
input range of +3 to +5V, eliminating the need for an additional
power supply. A 0 to –2V input range is available with ±5V
supply operation.
Another novel feature of the ADC-304 is its user-selectable
output coding. The MINV and LINV pins allow selection of
binary, complementary binary, and if external offset circuitry is
used for bipolar inputs, offset binary, two’s complement and
complementary two’s complement coding.
The ADC-304 is supplied in a 28-pin plastic DIP or a 28-pin
plastic SOP package. Operating temperature range is –20 to
+75°C. Storage temperature range is –55 to +150°C.
INPUT/OUTPUT CONNECTIONS
PLASTIC SOP PACKAGE
PIN FUNCTION PIN FUNCTION
1 ANALOG INPUT 28 ANALOG INPUT
2 VB SENSE 27 VT SENSE
3 ANALOG GND 26 ANALOG GND
4 VB 25 VT
5 VM 24 CLOCK INPUT
6 NO CONNECT 23 BIT 8 (LSB)
7 MINV 22 BIT 7
8 BIT 1 (MSB) 21 BIT 6
9 BIT 2 20 BIT 5
10 BIT 3 19 LINV
11 BIT 4 18 DIGITAL GND
12 DIGITAL GND 17 +5V POWER
13 +5V POWER 16 OVERRANGE
14 –5.2V POWER 15 –5.2V POWER
Figure 1. ADC-304 Functional Block Diagram
INNOVATION and EX C ELL E N C E
® ®
BIT 1 (MSB)
BIT 2
BIT 3
BIT 4
OVERRANGE a140
CLOCK
INPUT

BIT 8 (LSB)
LINV
BIT 7
BIT 6
BIT 5
ANALOG
INPUT
VB
VB SENSE a140

R/2
R/2
R/2
R
R
R
R

7
6
6
6
25
6-T
O-
24
BI
T E
NC
OD
ER
24
-TO
-8
BIT
EN
CO
DE
R
LA
TC
H
OU
TP
UT
BU
FF
ER
6
COMPARATOR
LATCH
1256
129
128
3
2
1




VM
VT SENSE a140
MINV
a140 THESE PINS ARE AVAILABLE ON SOP PACKAGE ONLY
VT
ANALOG
INPUT
ADC-304
8-Bit, 20MHz, Low-Power
Flash A/D Converters
DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.) • Tel: (508) 339-3000 Fax: (508) 339-6356 • For immediate assistance (800) 233-2765