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ADC-208A
8-Bit, 20MSPS CMOS Flash A/D (ADC-208 Compatible)
PRODUCT OVERVIEW
The ADC-208A utilizes an advanced VLSI 1.2 micron CMOS in providing 20MHz sampling rates at 8-bits. The flexibility of the design architecture and process delivers latch-up free operation without external components and operation over the full military range. The ADC-208A is mechanically and electrically equivalent to the ADC-208 Series, with the exception of the OVERFLOW (pin 13) and ENABLE (pins 11 and 12) functions. These functions are not offered on the ADC-208A.
FEATURES

Pin 1 2 3 4 5 6 7 8 9 10 11 12
8-bit flash A/D converter 20MHz sampling rate 10MHz full-power bandwidth Sample-hold not required Low power CMOS +5Vdc operation 1.2 Micron CMOS 8-Bit latched outputs Surface-mount version No missing codes
INPUT/OUTPUT CONNECTIONS FUNCTION Pin 24 VDD CLOCK INPUT -REFERENCE ANA/DIG GND (VSS) ANALOG INPUT REF MIDPOINT ANALOG INPUT ANA/DIG GND (VSS) +REFERENCE VDD N.C. N.C. 23 22 21 20 19 18 17 16 15 14 13
FUNCTION BIT 8 (LSB) BIT 7 BIT 6 BIT 5 REF 1/4 FS VDD REF 3/4 FS BIT 4 BIT 3 BIT 2 BIT 1 (MSB) N.C.
02 01
ANALOG INPUT
02 01
CLOCK GENERATOR
2
CLOCK
5,7
R2 +REFERENCE
9
D R G 1 Q
D G
Q
14
BIT 1
D G Q D G D G R2 Q 256 to 7 ENCODER D G
Q
15
BIT 2
3/4 REFERENCE
18
D G R
Q
16
BIT 3
1 R2 MIDPOINT REFERENCE
6
Q
17
BIT 4
1 1/4 REFERENCE
20
R2 D G D G R R2 Q D G Q Q
21
BIT 5
22
BIT 6
- REFERENCE
3
D D G Q G DIGITAL GND Q
PINS 1, 10, 19 +5V
+VDD
23
BIT 7
24
PINS 4-8 ANALOG GND
BIT 8 (LSB)
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Figure 1. ADC-208A Block Diagram
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MDA_ADC-208A.B01 Page 1 of 4
ADC-208A
8-Bit, 20MSPS CMOS Flash A/D (ADC-208 Compatible)
ABSOLUTE MAXIMUM RATINGS PARAMETERS
Power Supply Voltage (VDD Pin 1, 10, 19) Digital Inputs Analog Input Reference Inputs Digital Outputs (short circuit protected to ground) Lead Temperature (10 sec. max.) Storage Temperature
PERFORMANCE UNITS
Volts Volts Volts Volts Volts C C Int. Linearity @ +25C (ref. unadjusted) End-point Best-fit Line Int. Linearity Over Temp. (ref. unadjusted) End-point Best-fit Line Zero-Scale Offset (Code "0" to "1" transition) Gain Error Differential Gain Differential Phase degrees Aperture Delay Aperture Jitter Harmonic Distortion (8MHz second order harm.) Ref. bandwidth (See tech note 5) Power Supply Rejection No Missing Codes Power Supply Range (+VDD) Power Supply Current +25C +125C -55C Power Dissipation +25C +125C -55C Operating Temp. Range, Case: MC/LM Versions MM/LM/QL Versions Storage Temp. Range Package Type DIP LCC
MIN.
TYP.
MAX.
UNITS
LIMITS
-0.5 to +7 -0.5 to +5.5 -0.5 to (+VDD +0.5) -0.5 to (+VDD +0.5) -0.5 to +5.5 +300 max. -65 to +150
-- --
2 1.6
2.6 1.9
LSB LSB
-- -- -- -- -- -- -- -- -40
2.3 1.8 1 1.5 2 1.1 8 50 -46
2.6 2.0 2 3 -- -- -- -- --
LSB LSB LSB LSB %
FUNCTIONAL SPECIFICATIONS
(Typical at +5V power, +25C, 20MHz clock, +REFERENCE = +5V, -REFERENCE = ground, unless noted)
ANALOG INPUT
Single-Ended, Non-Isolated Input Range DC - 20MHz Analog Input Capacitance (static - Pin 5 to 7) (dynamic - Pin 5 to 7) Reference Ladder Resistance Reference Input (Note 5) Logic Levels Logic "1" Logic "0" Logic Loading Logic Loading "1" Logic Loading "0" Clock Low Pulse Width Logic Levels Logic "1" Logic "0" Logic Loading Logic Loading "1" Logic Loading "0" Output Data Valid Delay From Rising Clock Edge 99% probability 100% probability +25C -55C to +125C Data Output Resolution Data Coding Sampling Rate Full Power Bandwidth Diff. Linearity @ +25C (See tech note 7) Code Transitions Center of Codes Diff. Linearity Over Temp. Code Transitions Center of Codes Int. Linearity @ +25C (See tech note 4)(ref. adjusted) End-point Best-fit Line Int. Linearity Over Temp. (ref. adjusted) Best-fit Line
MIN.
0 - - - -0.5
TYP.
- 20 64 500 -
MAX.
+5.0 - - - VDD +0.5
UNITS
Volts pF pF Ohms Volts
ns ps dB
-- 10 -- MHz -- 0.02 0.05 %FSR/%Vs Over the operating temperature range
POWER REQUIREMENTS
+3.0 -- -- -- -- -- -- +5.0 +45 +40 +50 225 200 250 +5.5 +65 +60 +70 325 300 350 Volts mA mA mA mW mW mW
DIGITAL INPUTS
3.2 -- -- -- 15 -- -- +1 +1 25 -- 0.8 +5 +5 -- Volts Volts A A nSec
DIGITAL OUTPUTS
2.4 -- 4 4 4.5 -- -- -- 5.0 0.4 -- -- Volts Volts mA mA
PHYSiCAL ENVIRONMENTAL
0 -55 -65 -- -- -- +70 +125 +150 C C C
24-pin ceramic DIP 24-pin ceramic LCC
5 5 -- 8
10
15
nSec nSec nSec Bits
10 25 -- 40 -- -- Straight binary 20 -- -- --
Footnotes:
Maximum input impedance is a function of clock frequency. At full-power input. For 10-step, 40 IRE NTSC ramp test.
PERFORMANCE
15 10 MSPS MHz
TECHNICAL NOTES
1. The Reference ladder is floating with respect to VDD and may be referenced anywhere within the specified limits. AC modulation of the reference voltage may also be utilized; contact DATEL for further information. 2. Clock Pulse Width - To improve performance when input signals may exceed Nyquist bandwidths, the clock duty cycle can be adjusted so that the low portion (sample mode) of the clock pulse is 15nSec wide. Reducing the sampling time period minimizes the amount the input voltage slews and prevents the comparators from saturating. 3. A full-scale input produces all "1" on the data outputs. 4. DATEL uses the conservative definitions when specifying Intergal Linearity (end-point) and Differential Linearity (code transition). The specifications using the less conservative definition have also been provided as a comparative specification for products specified this way. 5. The process that is used to fabricate the ADC-208A eliminates the latchup phenomena that has plagued CMOS devices in the past. These converters do not require external protection diodes. 6. For clock rates less than 100kHz, there may be some degradation in offset and differential nonlinearity. Performance may be improved by increasing the clock duty cycle (decreasing the time spent in the sample mode).
-- -- -- --
0.5 0.25 0.5 0.25
1.0 -- 1.0 --
LSB LSB LSB LSB
-- --
-- --
1/2 1/2
LSB LSB
--
1/2
1
LSB
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MDA_ADC-208A.B01 Page 2 of 4
ADC-208A
8-Bit, 20MSPS CMOS Flash A/D (ADC-208 Compatible)
7. Connect the converter appropriately; a typical connection circuit is shown in Figure 2. Then apply an appropriate clock input.The reference input should be held to 0.1% accuracy or better. Do not use the +5V power supply as a reference without precision regulation and high-frequency decoupling capacitors. 8. Zero Adjustment - Adjusting the voltage at -REFERENCE (pin 3) adjusts the offset or zero of the device. Pin 3 can be tied to GROUND for operation without adjustments 9. Full Scale Adjustment - Adjusting the voltage at +REFERENCE (pin 9) adjusts the gain of the device. Pin 9 can be tied directly to a +5V reference for operation without adjustment. 10. Integral Nonlinearity Adjustments - Provision is made for optional adjustment of Integral Nonlinearity through access of the reference's 1/4, 1/2, and 3/4 full scale points. For example, the REF. MIDPOINT (pin 6) can be tied to a precision voltage halfway between +REFERENCE and -REFERENCE. Pins 6, 18 and 20 should be bypassed to GROUND through 0.1F capacitors for operation without INL adjustments
Table 1. ADC-208A Output Code
ANALOG INPUT 0.00V +0.02V +1.28V +2.54V +2.56V +2.58V +3.84V +5.10V CODE Zero 0000 +1 LSB +1/4 FS +1/2 FS-ILSB +1/2 FS +1/2 FS+ILSB +3/4 FS +FS DATA 1234 0000 0000 0100 0111 1000 1000 1100 1111 DATA 5678 0000 0001 0000 1111 0000 0001 0000 1111 DECIMAL 0 1 64 127 128 129 192 255 HEX 00 01 40 7F 80 81 C0 FF
Note: Values shown here are for a +5.12Vdc reference. Scale other refereces proportionally. (+REF=+5.12V, -REF=GND, 1/4, 1/2, and 3/4 References FS=No Connection)
+5V 4.7F + +15 0.01F +5V D GND 4 A GND 8 VDD 1,10,19 0.1F + 4.7F
B8 B7 B6 B5 B4 B3 B2 B1
24 (LSB) 23 22 21 17 16 15 14 (MSB) 20
12 5 HA-5033 10 11 10
20MHz CLOCK
CLOCK 2
VIN 5,7
REF-3
-15 + +15V 2 2 6 LM324 REF. D2 4 4.7F 2k 3 5 10k 1+N + 1-N 1 +15V
REF+9
4.7F 0.1F
REF MID 6
HP2811
R1/4 R3/4 18
9 0.1F
1-N 8 LM324 + 1+N 4.7F 0.1F
10
1k 0.1F 1.5k 6 1-N 7 1k 0.1F 1.5k 12 1k 13 0.1F 2k 1+N 4.7F 1-N 14 LM324 + 0.1F LM324 5 1+N 4.7F + 0.1F
Figure 2. ADC-208A Typical Connection Diagram
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MDA_ADC-208A.B01 Page 3 of 4
ADC-208A
8-Bit, 20MSPS CMOS Flash A/D (ADC-208 Compatible)
MECHNICAL DIMENSIONS
ADC-208A DIP
1.250 (31.7) 0.050 (1.27)
Pin 9
ADC-208A LCC
0.250 0.005 (6.35)
DATEL
ADC-208A
0.500 (12.7)
0.610 (15.5)
Pin 21
0.400 SQ. +0.010, -0.005 (10.16)
PIN 1 IDENTIFIER
Pin 1
0.020 0.005 (0.50)
0.190 (4.9) 0.38 (9.7)
0.090 Max. (2.28)
0.190 (4.9) 0.050 (1.3)
0.020 (0.5)
0.100 (2.5)
AUTO ZERO
SAMPLE N 02
AUTO ZERO
SAMPLE N+1 02
AUTO ZERO
SAMPLE N+2 02
ORDERING INFORMATION MODEL ADC-208AMC TEMP. RANGE 0C to +70C -55C to +125C 0C to +70C -55C to +125C PACKAGE 24-pin DIP 24-pin DIP 24-pin LCC 24-pin LCC
01
01
01
N DATA
N+1 DATA
ADC-208AMM ADC-208ALC
40nSec max.
40nSec max.
ADC-208ALM
Figure 3 Timing Diagram
The ADC-208AMM-QL replaces the ADC-208MM-QL and includes DATEL QL High-Reliability Screening. The ADC-208ALM-QL replaces the ADC-208LM.
USA: Canada: UK: France: Germany: Japan: China: Singapore:
Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com Munchen, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: sales@murata-ps.com ISO 9001 and 14001 REGISTERED
03/20/09
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. (c) 2008 Murata Power Solutions, Inc.
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