® ® ADC-30634/ADC-30720 8-Bit, 20MSPS CMOS Flash A/D (ADC-208 Compatible) FEATURES • • • • • • • • • • 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 GENERAL DESCRIPTION The ADC-30634 and ADC-30720 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-30634 and ADC-30720 are mechanically and electrically equivalent to the ADC-208LM and ADC208MM-QL, respectively, with the exception of the OVERFLOW (pin 13) and ENABLE (pins 11 and 12) functions. These functions are not offered on the ADC-30634 and ADC30720. PIN FUNCTION 1 2 3 4 5 6 7 8 9 10 11 12 VDD CLOCK INPUT –REFERENCE ANA/DIG GND (VSS) ANALOG INPUT REF MIDPOINT ANALOG INPUT ANA/DIG GND (VSS) +REFERENCE VDD N.C. N.C. 5,7 +REFERENCE 9 FUNCTION 24 23 22 21 20 19 18 17 16 15 14 13 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 02 01 ANALOG INPUT PIN CLOCK GENERATOR 2 CLOCK Q 14 BIT 1 Q 15 BIT 2 Q 16 BIT 3 Q 17 BIT 4 Q 21 BIT 5 Q 22 BIT 6 Q 23 BIT 7 24 BIT 8 (LSB) 01 R2 D D G R G Q 1Ω ¾ REFERENCE D 18 G D G Q D R G 1Ω R2 MIDPOINT REFERENCE 6 D G Q R2 256 to 7 ENCODER ¼ REFERENCE D G 1Ω 20 R2 D G D G Q R – REFERENCE D G R2 3 D PINS 1, 10, 19 +5V +VDD D G Q G DIGITAL GND PINS 4-8 ANALOG GND Figure 1. ADC-30634 and ADC-30720 Block Diagram DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 • E–mail: [email protected] • Internet: www.datel.com ADC-30634/ADC-30720 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 LIMITS UNITS –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 Volts Volts Volts Volts Volts +300 max. –65 to +150 °C °C PERFORMANCE Int. Linearity Over Temp. (ref. unadjusted) End-point Best-fit Line Zero-Scale Offset (Code "0" to "1" transition) Gain error, @ +25°C Over Temperature Differential Gain ➂ Differential Phase ➂ Aperture Delay Aperture Jitter Harmonic Distortion (8MHz second order harm.) Ref. bandwidth (See tech note 5) Power Supply Rejection No Missing Codes FUNCTIONAL SPECIFICATIONS (Typical at +5V power, +25°C, 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) MIN. TYP. MAX. UNITS 0 – +5.0 Volts – – – –0.5 20 64 500 – – – – VDD +0.5 pF pF Ohms Volts 3.2 — — — — 0.8 Volts Volts — — 15 +1 +1 25 +5 +5 — mA mA nSec Power Supply Range (+VDD) Power Supply Current +25°C +125°C –55°C Power Dissipation +25°C +125°C –55°C 2.4 — 4.5 — 5.0 0.4 Volts Volts 4 4 — — — — mA mA 5 5 — 8 10 Operating Temp. Range, Case: MM/LM/QL Versions Storage Temp. Range Package Type DIP LCC UNITS — — — ±2.3 ±1.8 ±2.5 ±2.6 ±2.0 ±4 LSB LSB LSB — — — — — — ±1 ±1.5 2 1.1 8 50 ±1.75 ±2.5 — — — — LSB LSB % degrees ns ps –40 –46 — dB — 10 — MHz — ±0.02 ±0.05 %FSR/%Vs Over the operating temperature range +3.0 +5.0 +5.5 Volts — — — +120 +100 +135 +160 +125 +175 mA mA mA — — — 660 550 745 880 690 965 mW mW mW –55 –65 — — +125 +150 °C °C 24-pin ceramic DIP 24-pin ceramic LCC Footnotes: ➀ Maximum input impedance is a function of clock frequency. ➁ At full-power input. ➂ For 10-step, 40 IRE NTSC ramp test. 15 nSec 10 25 — 40 — — Straight binary nSec nSec Bits 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. PERFORMANCE Sampling Rate ➁ Full Power Bandwidth Diff. Linearity @ +25°C (See tech note 7) Code Transitions Center of Codes Diff. Linearity Over Temp. Code Transitions Center of Codes Int. Linearity @ +25°C (See tech note 4)(ref. adjusted) End-point Best-fit Line Int. Linearity Over Temp. (ref. adjusted) Best-fit Line Int. Linearity @ +25°C (ref. unadjusted) End-point Best-fit Line MAX. PHYSICAL ENVIRONMENTAL DIGITAL OUTPUTS 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 +25°C –55°C to +125°C Data Output Resolution Data Coding TYP. POWER REQUIREMENTS DIGITAL INPUTS Logic Levels Logic "1" Logic "0" Logic Loading Logic Loading "1" Logic Loading "0" Clock Low Pulse Width MIN. 15 10 20 — — — MSPS MHz — — ±0.5 ±0.25 ±1.0 — LSB LSB — — ±0.5 ±0.25 ±1.0 — LSB LSB — — — — ±1/2 ±1/2 LSB LSB — ±1/2 ±1 LSB — — ±2 ±1.6 ±2.5 ±1.9 LSB LSB 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. DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 • E–mail: [email protected] • Internet: www.datel.com 2 ADC-30634-30720 5. The process that is used to fabricate the ADC30634/30720 eliminates the latchup phenomena that has plagued CMOS devices in the past. These converters do not require external protection diodes. Table 1. ADC-30634/ADC-30720 Output Code ANALOG INPUT 0.00V +0.02V +1.28V +2.54V +2.56V +2.58V +3.84V +5.10V 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). 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. CODE DATA 1234 DATA 5678 Zero 0000 +1 LSB +¼ FS +½ FS-ILSB +½ FS +½ FS+ILSB +¾ FS +FS 0000 0000 0100 0111 1000 1000 1100 1111 0000 0001 0000 1111 0000 0001 0000 1111 DECIMAL HEX 0 1 64 127 128 129 192 255 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, ¼, ½, and ¾ References FS=No Connection) 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 10.Integral Nonlinearity Adjustments - Provision is made for optional adjustment of Integral Nonlinearity through access of the reference's ¼, ½, and ¾ 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 0.1µF capacitors for operation without INL 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. +5V 4.7µF + +15 0.01µF 4.7µF 5 CLOCK 2 20MHz CLOCK 12 11 HA-5033 VDD 1,10,19 + D GND 4 0.1µF A GND 8 +5V 10Ω VIN 5,7 10 +15V +15V 2 2 REF MID 6 + REF-3 REF+9 –15 0.1µF 24 (LSB) B7 23 B6 22 B5 21 B4 17 B3 16 B2 15 B1 14 (MSB) 20 HP2811 4.7µF B8 R¼ 18 R¾ 1-N 6 1 LM324 REF. D2 3 5 1+N 10kΩ 1-N 9 4 8 + 4.7µF 0.1µF 10 2kΩ LM324 + 0.1µF 4.7µF 1+N 1kΩ 0.1µF 1.5kΩ 6 1-N 7 LM324 1kΩ + 5 0.1µF 0.1µF 4.7µF 1+N 1.5kΩ 12 1-N 14 LM324 1kΩ 13 0.1µF + 1+N 0.1µF 4.7µF 2kΩ Figure 2. ADC-30634 and ADC-30720 Typical Connection Diagram DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 • E–mail: [email protected] • Internet: www.datel.com 3 ADC-30634/ADC-30720 MECHNICAL DIMENSIONS ADC-30720 DIP ADC-30634 LCC 1.200 (30.5) 0.250 ±0.005 (6.35) 0.050 (1.27) DATEL 0.595 (15.1) ADC-30720 0.610 (15.5) 0.400 SQ. +0.010, –0.005 (10.16) PIN 1 IDENTIFIER 0.020 ±0.005 (0.50) 0.100 (2.5) 0.225 (5.7) 0.050 (1.3) 0.018 (0.5) 0.090 Max. (2.28) 0.325 (8.3) 0.100 (2.5) ORDERING INFORMATION AUTO ZERO 01 SAMPLE N AUTO ZERO 02 01 SAMPLE N+1 02 AUTO ZERO SAMPLE N+2 01 02 TEMP. RANGE PACKAGE ADC-30720 –55°C to +125°C ➀ 24-pin DIP ADC-30634 –55°C to +125°C ➁ 24-pin LCC N+1 DATA N DATA 15nSec max. MODEL ➀ The ADC-30720 replaces the ADC-208MM-QL and includes DATEL QL High-Reliability Screening. ➁ The ADC-30634 replaces the ADC-208LM. Contact DATEL for availability of the other equivalent ADC-208 versions. 15nSec max. Figure 3 Timing Diagram ® ® DS-0500B 12/01 DATEL (UK) LTD. Tadley, England Tel: (01256)-880444 DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 01-34-60-01-01 DATEL GmbH München, Germany Tel: 89-544334-0 DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-6354-2025 DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356 Internet: www.datel.com Email: [email protected] 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. 4