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ADC-228A
8-Bit, 20MHz, Complete Flash A/D Converter
PRODUCT OVERVIEW
The ADC-228A combines analog front-end circuitry and a flash A/D converter to digitize high-speed analog signals at a rate of 20 million samples per second. The ADC-228A contains an 8-bit, 20MHz, flash A/D, a wideband analog input buffer, a precision voltage reference, temperature compensation circuitry, reference trims, and a three-state output buffer in a 24-pin package. The ADC-228A offers significant savings by combining all of the circuitry in a single package. Valuable board real estate is saved, and design time and manufacturing costs are reduced. The ADC-228A is housed in a 24-pin ceramic DDIP package and is available in the commercial, 0 to +70°C, or military, –55 to +125°C, temperature ranges. A MIL-STD-883 version is also available. Operation is from ±15V and +5V power supplies.
Pin 1
INPUT/OUTPUT CONNECTIONS FUNCTION Pin +5V SUPPLY 24 GROUND +5V REFERENCE OUT GROUND ANALOG INPUT GROUND GROUND NO CONNECTION NO CONNECTION –15V SUPPLY CS1 CS2 23 22 21 20 19 18 17 16 15 14 13
FUNCTION BIT 8 (LSB) BIT 7 BIT 6 BIT 5 NO CONNECTION +15V SUPPLY CLOCK INPUT BIT 4 BIT 3 BIT 2 BIT 1 (MSB) NO CONNECTION
FEATURES
■ ■ ■ ■ ■ ■ ■
2 3 4 5 6 7 8 9 10 11 12
8-Bit flash A/D converter 20MHz sampling rate Complete support circuitry Low power, 900mW Sample-hold not required Three-state outputs MIL-STD-883 versions
CS1 11 CS2 12 NO CONNECTION 8 NO CONNECTION 9 CLOCK 18 ANALOG INPUT 5 INPUT BUFFER +15V SUPPLY 19 –15V SUPPLY 10 GROUND 7 GROUND 6 GROUND 4 GROUND 2 +5V SUPPLY 1 VOLTAGE REFERENCE NETWORK LINEARIZATION & TEMPERATURE COMPENSATION NETWORK 8-BIT 20MHz FLASH CONVERTER TRI-STATE BUFFER
13 NO CONNECTION 20 NO CONNECTION 14 BIT 1 (MSB) 15 BIT 2 16 BIT 3 17 BIT 4 21 BIT 5 22 BIT 6 23 BIT 7 24 BIT 8 (LSB) 3 +5V REF. OUT
Figure 1. Functional Block Diagram
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MDA_ADC-228A.B01 Page 1 of 4
ADC-228A
8-Bit, 20MHz, Complete Flash A/D Converter
ABSOLUTE MAXIMUM RATINGS
PARAMETER Power Supply Voltage, Pin 1 Pin 19 Pin 10 –0.5 to +5.5V LIMITS –0.3 to +7V –0.3 to +18V +0.3 to –18V –3.8 to +6.6V –0.5 to +5.5V (short circuit protected to ground) +300°C Total Harm. Distortion, –0.5dB DC to 2.5 MHz 2.5 MHz to 5 MHz 5 MHz to 10 MHz Signal-to-Noise Ratio and Distortion, –0.5dB DC to 2.5 MHz 2.5 MHz to 5 MHz 5 MHz to 10 MHz Signal-to-Noise Ratio w/o Distortion, –0.5 dB DC to 2.5 MHz 2.5 MHz to 5 MHz 5 MHz to 10 MHz Effective Bits, –0.5dB DC to 2.5 MHz 2.5 MHz to 5 MHz 5 MHz to 10 MHz Input Bandwidth Large Signal (–3dB) Small Signal (–20dB) Power Supply Range +15V Supply –15V Supply +5V Supply Power Supply Current +15V Supply –15V Supply +5V Supply Power Dissipation ±15V, +5V Nominal Operating Temp. Range, Case ADC-228AMC ADC-228AMM, ADC-228A/883 Storage Temp. Range Package Type Weight
PERFORMANCE
Gain error Full Scale Absolute Accuracy Differential Gain ➁ Differential Phase ➁ Aperture Delay Aperture Jitter No Missing Codes Power Supply Rejection
MIN.
— — — — — —
TYP.
±0.5 ±0.5 2 1 8 50
MAX.
±1.5 ±1.5 — — — —
UNITS
LSB LSB % deg. ns ps
Digital Inputs, Pins 8,9,11,12,18 Analog Input, Pin 5 Digital Outputs Lead Temp. (10 seconds)
Over the operating temperature range ±0.02% FSR/%VS maximum
DYNAMIC PERFORMANCE
FUNCTIONAL SPECIFICATIONS
(Apply over the operating temperature range with 20MHz clock and ±15V and +5V power supply voltages, unless otherwise specified.) ANALOG INPUTS
Single-Ended, Non-Isolated Input Range, dc-20MHz Input Resistance Input Capacitance Logic Levels Logic 1 Logic 0 Logic Loading Logic 1 Logic 0 Clock Pulse Widths "High" "Low" Coding Resolution Logic Levels Logic 1 Logic 0 Logic Loading Logic 1 Logic 0 Output Data Valid Delay From Rising Edge Output Hold Time Sampling Rate ➀ Differential Linearity Code Transitions, +25°C 0 to +70°C –55 to +125°C Integral Linearity, +25°C End-point Best-fit Line Over Temperature End-point Best-fit Line Zero-Scale Offset Code "0" to "1" Transition +25°C –55 to +125°C
— — —
–55 –49 –39
–53 –44 –36
dB dB dB
MIN.
0 1.95 —
TYP.
— 2 5
MAX.
+5.0 — 10
UNITS
Volts kΩ pF
44 41 35
49 46 38
— — —
dB dB dB
DIGITAL INPUTS
+2.0 — — — 20 20 — — — — — — — +0.8 +160 –0.5 — — Volts Volts µA mA ns ns
45 44 42 7.1 6.8 5.6 15 40
48 49 45 7.75 7.4 6.1 — —
— — — — — — — —
dB dB dB Bits Bits Bits MHz MHz
DIGITAL OUTPUTS Straight Binary 8 Bits
+2.4 — — — — 6 — — — — — — — — +0.4 –1 +1 40 — — Volts Volts mA mA ns ns MHz
POWER SUPPLY
+11 –11 +4.75 — — — — +15 –15 +5 +12 –13 +70 0.7 +15.75 –15.75 +5.25 +20 –20 +80 0.9 Volts Volts Volts mA mA mA Watts
PERFORMANCE
20
PHYSICAL/ENVIRONMENTAL
0 to +70°C –55 to +125°C –65 to +150°C 24-pin, ceramic DDIP 0.3 ounces (8.5 grams)
— — — — — — —
±0.5 ±0.5 ±0.5 ±0.5 ±0.35 — —
±0.75 ±0.75 ±0.85 ±1 ±0.75 ±1.75 ±1
LSB LSB LSB LSB LSB LSB LSB
— —
±0.5 ±0.5
±1 ±1.5
LSB LSB
Footnotes: ➀ At full power input and chip selects enabled. ➁ For 10-step, 40 IRE NTSC ramp test.
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MDA_ADC-228A.B01 Page 2 of 4
ADC-228A
8-Bit, 20MHz, Complete Flash A/D Converter
TECHNICAL NOTES
1. Rated performance requires using good high-frequency techniques. The analog and digital ground pins are connected to each other internally. Avoid ground related problems by connecting the grounds to one point, the ground plane beneath the converter. Due to the inductance and resistance of the power supply return paths, return the analog and digital ground separately to the power supplies. 2. Bypass all the analog and digital supplies and the +5V REFERENCE (pin 3) to ground with a 4.7µF, 25V tantalum electrolytic capacitor in parallel with a 0.1µF ceramic capacitor.
Table 1. ADC-228A Unipolar Output Coding
ANALOG INPUT +4.96V +3.75V +2.50V +1.25V +0.02V 0.00V CODE +FS – 1 LSB + 3/4 FS + 1/2 FS + 1/4 FS + 1 LSB ZERO STRAIGHT BIN. 1111 1110 1100 0000 1000 0000 0100 0000 0000 0001 0000 0000
Table 2. Chip Select Truth Table
CS2 Pin 12 0 0 1 1 CS1 Pin 11 0 1 0 1 Bits 1-8 Three State Mode Three State Mode Data Outputted Three State Mode
CLOCK
SAMPLE N
SAMPLE N+1 OUTPUT DELAY
SAMPLE N+2
DIGITAL OUTPUT OUTPUT HOLD TIME
DATA N
DATA N+1
DATA N+2
Figure 2. ADC-228A Timing Diagram
+5V 0.1μF 4.7μF + 1
–15V 0.1μF
10
4.7μF
+ 14 15 16 17 B1 (MSB) B2 B3 B4 B5 B6 B7 B8 (LSB) NO CONNECTION +5V REFERENCE OUT 0.1μF
CS1 11
21
ADC-228A
CS1 12 CLOCK 18 ANALOG INPUT VIN 5 19 0.1μF 2, 4, 6, 7
22 23 24
8, 9, 13, 20 3
51Ω
9kΩ *Optional
+ 4.7μF
* Use optional resistor only if amp is not used to drive input. R = V /1.667mA EE
+
4.7μF
+15V
Figure 3. ADC-228A Typical Connections
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MDA_ADC-228A.B01 Page 3 of 4
ADC-228A
8-Bit, 20MHz, Complete Flash A/D Converter
1.31 MAX. (33.27) Dimension Tolerances (unless otherwise indicated): 2 place decimal (.XX) ±0.010 (±0.254) 3 place decimal (.XXX) ±0.005 (±0.127) 0.80 MAX. (20.32) 1 12 Lead Material: Kovar alloy Lead Finish: 50 microinches (minimum) gold plating over 100 microinches (nominal) nickel plating
24
13
0.100 TYP. (2.540) 1.100 (27.940) 0.235 MAX. (5.969) 0.200 MAX. (5.080)
0.010 –0.001 (0.254) 0.190 MAX. (4.826) 0.018 ±0.002 (0.457) 0.100 (2.540) 0.040 (1.016)
+0.002
SEATING PLANE 0.025 (0.635)
0.600 ±0.010 (15.240)
0.100 (2.540)
ORDERING INFORMATION MODEL ADC-228AMC ADC-228AMM ADC-228A/883 * TEMPERATURE RANGE 0 to +70°C –55 to +125°C –55 to +105°C SAMPLING RATE 20MSPS 20MSPS 15MSPS
Receptacle for PC board mounting can be ordered through AMP Inc., part # 3-331272-8 (component lead socket), 24 required. Contact DATEL for 883 product specifications
* DATEL's initial qualification was done at 15MSPS and as a Mil-STD-883 Class G product per
customer request. Mil-STD-883 Class G allows for a reduced temperature range (–55°C to +105°C) that applies to this device. Contact DATEL if a 20MSPS rate or a Mil-STD-883 Class H (–55°C to +125°C) temperature range is desired.
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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 München, 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
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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. © 2009 Murata Power Solutions, Inc.
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MDA_ADC-228A.B01 Page 4 of 4