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®®
ADC-318, ADC-318A
8-Bit, 120MHz and 140MHz
Full-Flash A/D Converter
FEATURES
• Low power dissipation (960mW max.)
• TTL compatible output
• Diff./Integral nonlinearity (±½LSB max.)
• 1:2 Demultiplexed straight output programmable
• 2:1 Frequency divided TTL clock output with reset
• Surface mount package
• Selectable Input Logic (TTl, ECL, PECL)
• +5V or ±5V Power Supply Operation
GENERAL DESCRIPTION
The ADC-318 and ADC-318A are 8 bit monolithic bipolar,
full flash A/D converters. Though they have high, 120MHz
(ADC-318) and 140MHz (ADC-318A), sampling rates, their
input logic level, including the start convert pulse, is TTL,
ECL and PECL compatible. Digital outputs are also TTL
compatible and allow a straight output or a programmable
1:2 de-multiplexed output.
The ADC-318 and ADC-318A feature ±1/2 LSB max.
integral and differential non-linearity, +5V single or ±5V dual
power supply operation, a low 960mW maximum power
dissipation, 150MHz wide analog input range and excellent
temperature coefficient in a small 48 pin QFP package. The
start convert pulse can have a 50% duty cycle.
The ADC-318 and ADC-318A offer low cost, easy to use
functionality for design engineers.
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION
PIN FUNCTION
1 –DVs (Digital)
48
2 REF. BOTTOM (VRB)
47
3 ANALOG GROUND
46
4 REF. MID POINT (VRM1) 45
5 +AVS (Analog)
44
6 ANALOG IN (VIN)
43
7 REF. MID POINT (VRM2) 42
8 +AVS (Analog)
41
9 REF. MID POINT (VRM3) 40
10 ANALOG GROUND
39
11 REF. TOP (VRT)
38
12 DIGITAL GROUND 3
37
13 A/D CLOCK ECL/PECL 36
14 A/D CLOCK ECL/PECL 35
15 A/D CLOCK TTL
34
16 NO CONNECTION
33
17 NO CONNECTION
32
18 NO CONNECTION
31
19 +DVS2 (Digital)
30
20 DIGITAL GROUND 2
29
21 B BIT 8 (LSB)
28
22 B BIT 7
27
23 B BIT 6
26
24 B BIT 5
25
RSET ECL/PECL
RSET ECL/PECL
RSET TTL
SELECT
INV
TTL CLOCK OUT
+DVS2 (Digital)
DIGITAL GROUND 2
A BIT 1 (MSB)
A BIT 2
A BIT 3
A BIT 4
A BIT 5
A BIT 6
A BIT 7
A BIT 8 (LSB)
DIGITAL GROUND 2
+DVS2 (Digital)
+DVS1 (Digital)
DIGITAL GROUND 1
B BIT 1 (MSB)
B BIT 2
B BIT 3
B BIT 4
VIN 6
VRT 11
VRM3 9
VRM2 7
VRM1 4
VRB 2
A/D CLOCK ECL/PECL 13
A/D CLOCK ECL/PECL 14
A/D CLOCK TTL 15
RSET ECL/PECL 48
RSET ECL/PECL 47
RSET TTL 46
6
6
256
6
6
DELAY
DQ
Q
8
A
LATCH
8
A
TTL
OUTPUT
44 INV
33 BIT 8 (LSB)
34 BIT 7
35 BIT 6
36 BIT 5 A OUTPUT
37 BIT 4
38 BIT 3
39 BIT 2
40 BIT 1 (MSB)
B
LATCH
6
B
TTL
OUTPUT
21 BIT 8 (LSB)
22 BIT 7
23 BIT 6
24 BIT 5 B OUTPUT
25 BIT 4
26 BIT 3
27 BIT 2
28 BIT 1 (MSB)
SELECT
43 CLOCK OUT
TTL
45 SELECT
Figure 1. ADC-318/318A Functional Block Diagram
DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: (508) 339-3000, (800)233-2765 Fax: (508) 339-6356 • Email: [email protected] • Internet: www.datel.com
ADC-318, ADC-318A
®®
ABSOLUTE MAXIMUM RATINGS
PARAMETERS
LIMITS
UNITS
Supply Voltage (+AVS, +DVS, 1,2)
Supply Voltage (AGND, DGND 1, 2)
Supply Voltage (DGND 3)
Supply Voltage (–DVS)
Supply Voltage (–DVS)
Reference Voltage (VRT)
Reference Voltage (VRB)
Reference Voltage (VRT–VRB1)
Input Voltage, analog (VIN)
Input Voltage, digital
ECL
PECL
TTL
Diff. Voltage between Pin
Power Dissipation, max.
–0.5 to +7.0
–0.5 to +7.0
–0.5 to +7.0
–0.5 to +7.0
–7.0 to +0.5
+2.7 to +AVS
VIN –2.7 to +AVS
2.5
VRT –2.7 to +AVS
–DVS to +0.5
–0.5 to DGND3
–0.5 to +DVS1
2.7
2
Volts
Volts
Volts
Volts
Volts
Volts
Volts
Volts
Volts
Volts
Volts
Volts
W
Footnote:
Single Supply
Dual Supply
A/D Clock–A/D Clock and RESET–RESET of ECL/PECL logic inputs.
With ADC-318 mounted on a 50x50mm glass fiber base
epoxy board, 1.6mm thick.
FUNCTIONAL SPECIFICATIONS
(Typical at TA = 25°C, VRT = +4V, VRB = +2V, DGND3 = +DVS1= +DVS2 = +AVS =
+5V, –DVS = 0V, PECL Logic, unless otherwise specified.)
ANALOG INPUTS
MIN. TYP. MAX. UNITS
Input Voltage
Input Resistance
Input Current
Input Capacitance
Input Bandwidth
VIN = 2Vp-p, –3dB
REFERENCE INPUTS
— +2 to +4 —
4 — 50
0 — 500
— 21 —
150 — —
Volts
kΩ
µA
pF
MHz
Reference Voltage
VRT
VRB
VRT–VRB
Reference Resistance
Reference Current
VRT Offset Voltage
VRB Offset Voltage
DIGITAL INPUTS
+2.9 — +4.1 Volts
+1.4 — +2.6 Volts
1.5 — 2.1 Volts
75 115 155 Ω
9.7 17.4 28 mA
2 — 15 mV
2 — 10 mV
ECL, PECL
Input Voltage "1"
Input Voltage "0"
Threshold Voltage
Input Current "1"
Input Current "0"
Voltage Difference
TTL
Input Voltage "1"
Input Voltage "0"
Threshold Voltage
Input Current "1"
Input Current "0"
Select
Input Voltage "1"
Output Voltage "0"
Input Capacitance
DGND3–1.05 — DGND3–0.5
DGND3–3.2
— DGND3–1.4
— DGND3–1.2 —
–50 — +50
–75 —
0
0.4 0.8 —
Volts
Volts
Volts
µA
µA
Volts
+2.0 — — Volts
— — +0.8 Volts
— +1.5 — Volts
–50 — 0 µA
–500 — 0 µA
— +DVS1 —
— +DGND1 —
— —5
pF
DIGITAL INPUTS
A/D Clock Pulse Width (TPW1)
ADC-318
ADC-318A
A/D Clock Pulse Width (TPW0)
ADC-318
ADC-318A
RSET Setup Time (Trs)
RSET Hold Time (Trh)
DIGITAL OUTPUTS
Output Voltage "1" (@–2mA)
Output Voltage "0" (@1mA)
Output Rise Time (Tr)
Output Fall Time (Tf)
Output Delay (Tdo1)
Output Delay (Tdo2)
Clockout Output Delay (Tdclk)
PERFORMANCE
Resolution
Conversion Rate (fS)
Straight Mode
ADC-318
ADC-318A
De-multiplexed Mode
ADC-318
ADC-318A
Sampling Delay (TdS)
Aperture Jitter (Taj)
Integral Linearity Error
Diff. Linearity Error
S/N Ratio
ADC-318
(@fIN = 1kHz)
(@fIN = 29.999MHz)
ADC-318A
(@fIN = 1kHz)
(@fIN = 34.999MHz)
Error Rate
ADC-318
(@fIN = 1kHz)
(@fIN = 29.999MHz)
(@fIN = 24.999MHz)
ADC-318A
(@fIN = 1kHz)
(@fIN = 34.999MHz)
(@fIN = 24.999MHz)
POWER REQUIREMENTS
Supply Voltage
One Power Supply
(+AVS, +DVS 1,2)
One Power Supply (DGND3)
One Power Supply (–DVS)
Two Power Supply
(+AVS, +DVS 1,2)
Two Power Supply (DGND3)
Two Power Supply (–DVS)
ADC-318
Supply Current (+IS)
Supply Current (–IS)
ADC-318A
Supply Current (+zS)
Supply Current (–zS)
MIN. TYP. MAX. UNITS
3.2 — — ns
3.0 — — ns
3.2 — — ns
3.0 — — ns
3.5 — — ns
0 — — ns
2.4 — — Volts
— — +0.5 Volts
— 2 — ns
— 2 — ns
1/Fc 1/Fc+1 1/Fc+2
ns
6.5 8 10 ns
4.5 7 8 ns
8 — — Bit
100 — — MHz
100 — — MHz
100 — — MHz 13
100 — — MHz 13
3 4.5 6 ns 13
— 10 — ps
— — ±0.5 LSB
— — ±0.5 LSB
— 46 — dB
— 40 — dB
— 46 — dB
— 40 — dB
—
—
10-12
TPS 1 1
— — 10-9 TPS 1 1
— — 10-9 TPS 1 1
—
—
10-12
TPS 1 1
— — 10-9 TPS 1 1
— — 10-9 TPS 1 1
+4.75
+4.75
–0.05
+4.75
–0.05
–5.5
125
0.4
110
0.4
+5.0 +5.25 Volts
+5.0 +5.25 Volts
0 +0.05 Volts
+5.0 +5.25 Volts
0 +0.05 Volts
–5.0 –4.75 Volts
145 185
0.6 0.8
mA
mA
150 185
0.6 0.8
mA
mA
2
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