ADC-228 ETC | Alldatasheet

Document overview

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Technical content

FEATURES

  • 8-Bit flash A/D converter
  • 20MHz sampling rate
  • Complete support circuitry
  • Low power, 1.5W
  • 7MHz full power bandwidth
  • Sample-hold not required
  • Three-state outputs
  • MIL-STD-883 versions GENERAL DESCRIPTION The ADC-228 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-228 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-228 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-228 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. INN O VAT IO N an d E X C ELL E N C E ® ® ADC-228 8-Bit, 20MHz, Complete Flash A/D Converter

Figure 1. Functional Block Diagram

2 GROUND 23 BIT 7

4 GROUND 21 BIT 5

5 ANALOG INPUT 20 NO CONNECTION

6 GROUND 19 +15V SUPPLY

7 GROUND 18 CLOCK INPUT

8 NLINV 17 BIT 4

9 NMINV 16 BIT 3

11 CS1 14 BIT 1 (MSB)

12 CS1 13 NO CONNECTION

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)

® ® FUNCTIONAL SPECIFICATIONS (Apply over the operating temperature range with 20MHz clock and ±15V and +5V power supply voltages, unless otherwise specified.) ANALOG INPUTS MIN. TYP. MAX. UNITS Single-Ended, Non-Isolated Input Range, dc-20MHz 0 — +5.0 Volts Input Resistance 2.45 2.5 2.55 kΩ Input Capacitance — 5 10 pF DIGITAL INPUTS Logic Levels Logic 1 +2.0 — — Volts Logic 0 — — +0.8 Volts Logic Loading Logic 1 — — +160 µA Logic 0 — — –0.5 mA Clock Pulse Widths "High" 25 — — ns "Low" 19 — — ns DIGITAL OUTPUTS Coding Resolution Logic Levels Logic 1 +2.4 — — Volts Logic 0 — — +0.4 Volts Logic Loading Logic 1 — — –1 mA Logic 0 — — +1 mA Output Data Valid Delay From Rising Edge — 30 40 ns Output Hold Time 5 — — ns PERFORMANCE Sampling Rate ➀ 20 — — MHz Differential Linearity ➁ Code Transitions — ±0.5 ±0.75 LSB Code Centers — ±0.25 ±0.5 LSB Integral Linearity, +25°C End-point — ±0.5 ±0.75 LSB Best-fit Line — ±0.35 ±0.5 LSB Over Temperature End-point — — ±1 LSB Best-fit Line — — ±1 LSB Zero-Scale Offset Code "0" to "1" Transition +25°C — — ±0.5 LSB Gain error — ±0.5 ±1.5 LSB Full Scale Absolute Accuracy — ±0.5 ±1.5 LSB Differential Gain ➂ — 2 — % Differential Phase ➂ — 1 — deg. Aperture Delay — 8 — ns Aperture Jitter — 50 — ps No Missing Codes Power Supply Rejection DYNAMIC PERFORMANCE MIN. TYP. MAX. UNITS Total Harm. Distortion, –0.5dB DC to 2.5 MHz — –55 –53 dB

2.5 MHz to 5 MHz — –50 –48 dB

5 MHz to 10 MHz — –39 –36 dB

and Distortion, –0.5dB DC to 2.5 MHz 44 49 — dB

2.5 MHz to 5 MHz 43 46 — dB

5 MHz to 10 MHz 35 38 — dB

w/o Distortion, –0.5 dB DC to 2.5 MHz 45 48 — dB

2.5 MHz to 5 MHz 45 48 — dB

5 MHz to 10 MHz 42 45 — dB

Effective Bits, –0.5dB DC to 2.5 MHz 7.1 7.75 — Bits 2.5 MHz to 5 MHz 6.9 7.4 — Bits 5 MHz to 10 MHz 5.6 6.1 — Bits Input Bandwidth Full Power 7 — — MHz Small Signal (–20dB) 40 — — MHz POWER SUPPLY Power Supply Range +15V Supply +11 +15 +15.75 Volts –15V Supply –11 –15 –15.75 Volts +5V Supply +4.75 +5 +5.25 Volts Power Supply Current +15V Supply — — +30 mA –15V Supply — — –10 mA +5V Supply — — +230 mA Power Dissipation ±12V, +5V Nominal — 1.4 1.65 Watts Over full supply range — 1.6 1.85 Watts ±15V, +5V Nominal — 1.5 1.75 Watts PHYSICAL/ENVIRONMENTAL Operating Temp. Range, Case ADC-228MC 0 to +70°C ADC-228MM, ADC-228/883 –55 to +125°C Storage Temp. Range –65 to +150°C Package Type 24-pin, ceramic DDIP Weight 0.3 ounces (8.5 grams) Footnotes: ➀ At full power input and chip selects enabled. ➁ See Technical Note 3. ➂ For 10-step, 40 IRE NTSC ramp test. ABSOLUTE MAXIMUM RATINGS PARAMETER LIMITS Power Supply Voltage, Pin 1 –0.5 to +7V Pin 19 –0.3 to +18V Pin 10 +0.3 to –18V Digital Inputs, Pins 8 ,9,11,12,18 –0.5 to +5.5V Analog Input, Pin 5 –6 to +7.5V Digital Outputs –0.5 to +5.5V (short circuit protected to ground) Lead Temp. (10 seconds) +300°C Over the operating temperature range ±0.02% FSR/%VS maximum Straight bin., comp. bin., two's comp., comp. two's comp. 8 bits

Table 3. Chip Select Truth Table Figure 4. ADC-228 Timing Diagram

ORDERING INFORMATION

ADC-228MC 0 to +70°C ADC-228MM –55 to +125°C ADC-228/883 –55 to +125°C 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 IN N OVAT ION a nd E X C ELL E N C E ® ® DATEL 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. The DATEL logo is a registered DATEL, Inc. trademark. DS-0211B 10/96 ISO 9001ISO 9001REGISTERED DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356 Internet: www.datel.com E-mail:sales@datel.com Data Sheet Fax Back: (508) 261-2857 DATEL (UK) LTD. Tadley, England Tel: (01256)-880444 DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 1-34-60-01-01 DATEL GmbH München, Germany Tel: 89-544334-0 DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-354-2025