ADC-304

ADC-304 ETC | Alldatasheet

Document overview

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Technical content

1 BIT 1 (MSB) 28 MINV

2 BIT 2 27 VM

3 BIT 3 26 VB

4 BIT 4 25 ANALOG GND

5 DIGITAL GND 24 NO CONNECT

6 +5V POWER 23 ANALOG INPUT 7 –5.2V PO WER 22 NO CONNECT 8 –5.2V PO WER 21 ANALOG INPUT 9 –5.2V PO WER 20 NO CONNECT 10 +5V POWER 19 ANALOG GND

11 DIGITAL GND 18 VT

12 LINV 17 CLOCK INPUT

13 BIT 5 16 BIT 8 (LSB)

14 BIT 6 15 BIT 7

FEATURES

• 8-bit resolution
• 20MHz conversion rate
• ±1/2LSB maximum nonlinearity
• 8MHz input bandwidth
• Low power consumption, 375mW
• TTL compatible
• Single or dual supply operation GENERAL DESCRIPTION Datel’s ADC-304 is an 8-bit, 20MHz analog-to-digital flash converter. The ADC-304 offers many performance features not obtainable from other flash A/D’s. Key reatures include a low power dissipation of 375mW and TTL-compatible outputs. A wide analog input bandwidth of 8MHz (–3dB) allows operation without the need of a sample- hold. Also, single +5V supply operation is obtainable with an input range of +3 to +5V, eliminating the need for an additional power supply. A 0 to –2V input range is available with ±5V supply operation. Another novel feature of the ADC-304 is its user-selectable output coding. The MINV and LINV pins allow selection of binary, complementary binary, and if external offset circuitry is used for bipolar inputs, offset binary, two’s complement and complementary two’s complement coding. The ADC-304 is supplied in a 28-pin plastic DIP or a 28-pin plastic SOP package. Operating temperature range is –20 to +75°C. Storage temperature range is –55 to +150°C. INPUT/OUTPUT CONNECTIONS PLASTIC SOP PACKAGE PIN FUNCTION PIN FUNCTION

1 ANALOG INPUT 28 ANALOG INPUT

2 VB SENSE 27 VT SENSE

3 ANALOG GND 26 ANALOG GND

4 VB 25 VT

5 VM 24 CLOCK INPUT

6 NO CONNECT 23 BIT 8 (LSB)

7 MINV 22 BIT 7

8 BIT 1 (MSB) 21 BIT 6

9 BIT 2 20 BIT 5

10 BIT 3 19 LINV

11 BIT 4 18 DIGITAL GND

12 DIGITAL GND 17 +5V POWER

14 –5.2V PO WER 15 –5.2V PO WER Figure 1. ADC-304 Functional Block Diagram

® ® ADC-304 FUNCTIONAL SPECIFICATIONS Unless otherwise noted, the following specifications apply to the ADC-304 when used either with a single or dual power source. The test conditions are: For single power supply operation: For dual power supply operation: +VS = +5V, DIG GND = 0V +VS = +5V, DIG GND = 0V –V S = 0V, VT = +5V –V S = –5.2V, VT = 0V, VB = +3V, TA = +25°C VB = –2V, TA = +25°C ANA GND = +5V, fs = 20MHz ANA GND = 0V, fs = 20MHz ANALOG INPUTS MIN. TYP. MAX. UNITS Input Range VB VT Volts Input Capacitance — 30 35 pF Input Bias Current 15 50 100 µA Offset Voltage VT –8 –13 –19 mV VB 0 +5 +11 mV DIGITAL INPUTS Logic Levels Logic “1” +2.0 — — Volts Logic “0” — — +0.8 Volts Logic Input Currents Logic “0” –0.1 –0.32 –0.5 mA PERFORMANCE Conversion Rate ➀ 20 — — MHz Integral Nonlinearity — — ±1/2 LSB Differential Nonlinearity — — ±1/2 LSB Differential Gain Error ➁ — — 1.5 % Differential Phase Error ➁ — — 0.5 degrees Aperture Delay Ta 5 7 9 ns Aperture Uncertainty — 30 — ps Signal-to-Noise and Distortion (Vin = full scale, fs = 20MHz) fin = 1MHz 47 dB fin = 5MHz 43 dB fin = 10MHz 35 dB Clock Pulse Width Tpw1 35 — — ns Tpw0 10 — — ns Reference Pin Current 11 15 18 mA Reference Resistance (VT to VB) — 130 — Ohms Reference Input (dual supply) VT –0.1 0 +0.1 Volts VB –1.8 –2.0 –2.2 Volts Footnotes: ➀ fin = 1kHz, ramp ➁ NTSC 40 IRE-modulated ramp, fs = 14.3MHz ABSOLUTE MAXIMUM RATINGS PARAMETERS LIMITS UNITS Supply Voltages +VS to GND 0 to +6 Volts –V S to GND 0 to –6 Volts Input Voltage (Analog) Vin –V S to (ANA GND + 0.3) Volts (dual power supply) Input Voltage (Reference) VT, VB, VM –V S to (ANA GND + 0.3) Volts (dual power supply) ❘ VT – VB ❘ 2.5 Volts Input Current IM –3.0 to +3.0 mA Input Voltage (Digital) Digital Inputs –0.5 to +V S Volts DIGITAL OUTPUTS MIN. TYP. MAX. UNITS Resolution and Output Coding 8 bits Straight binary Complementary binary Two’s complement Complementary two’s complement Logic Levels Logic “1” +2.7 +3.4 — Volts Logic “0” — — +0.5 Volts Logic Loading “1” — –500 — µA Logic Loading “0” — — +3 mA Output Data Delay TDLH 15 20 30 ns TDHL 22 26 35 ns POWER REQUIREMENTS Single Power Supply Supply Voltage = +VS +4.75 +5.0 +5.25 Volts Supply Voltage = –VS — 0 — Volts Supply Current = +IS +56 +71 +91 mA Power Dissipation 280 355 455 mW Dual Power Supply Supply Voltage = +VS +4.75 +5.0 +5.25 Volts Supply Voltage = –VS –4.75 –5.2 –5.5 Volts Supply Current = +IS +7 +10 +14 mA Supply Current = –I S –50 –62 –78 mA Power Dissipation 295 375 476 mW PHYSICAL/ENVIRONMENTAL Operating Temperature –20 — +75 °C Storage Temperature –55 — +150 °C TECHNICAL NOTES 1. The two DIGITAL GND pins (pins 5 and 11 on the DIP, pins 12 and 18 on the SOP) are not connected to each other internally and neither are the two +5V POWER pins (6 and 10 on the DIP, 13 and 17 on the SOP). All four pins must be externally connected to the appropriate pcb patterns. Also, the DIGITAL GND and ANALOG GND pins are not connected to each other internally. 2. Layout of the analog and digital sections should be separated to reduce interference from noise. To further guard against unwanted noise, it is recommended to bypass, as close as possible, the voltage supply pins to their respective ground pins with 1µF tantalum and 0.01µF ceramic disk capacitors in parallel. 3. The input capacitance of the analog input is much smaller than that of a typical flash A/D converter. It is necessary to use an amplifier with sufficient bandwidth and driving power. The analog input pins are separated internally, so they should be connected together externally. If the ADC-304 is driven with a low output impedance amplifier, parasitic oscillations may occur. These parasitic oscillations can be prevented by introducing a small resistance of 2 to 10 Ω between the amplifier output and the ADC-304’s A/D input. This resistance must have a very low value of series inductance at high frequencies. Note that each of the analog input pins is divided in this manner with these resistances. Connect the driving amplifier as close as possible to the A/D input of the ADC-304.

15 BIT 6 BIT 7

Figure 4. Connections for +5V Power Supply Operation Figure 5. Connections for ±5V Power Supply Operation Table 2. Output Coding for ±5V Power Supply Operation (0 to –2V Signal Input) Table 1. Output Coding for +5V Power Supply Operation (+3 to +5V Signal Input)

® ® MECHANICAL DIMENSIONS MODEL PACKAGE ADC-304 28-pin DIP (plastic) ADC-304-3 28-pin SOP (plastic) ADC-304-3 28-Pin SOP (Plastic) ADC-304 28-Pin DIP (Plastic) ADC-304 1.494 ±0.010 (37.95 ±0.25) 0.022 ±0.004 (0.55 ±0.10) 0.100 TYP. (2.540) 0.051 ±0.006 (1.30 ±0.15) 0.187 ±0.010 (4.75 ±0.25) 0.118 MIN. (3.0 MIN.) 0° to 15° 0.011 ±0.003 (0.28 ±0.08) 0.52 ±0.02 (13.2 ±0.3) 0.600 (15.24) SEATING PLANE 0.020 MIN. (0.50 MIN.) ADC-304 0.018 ± 0.004 (0.45 ± 0.1) 0.090 ±0.011 (2.30 ±0.28) 0.30 ±0.01 (7.7 ±0.2) 0.366 (9.3) 0.006 ±0.003 (0.15 ±0.08) 0.050 TYP. (1.270) 0.41 ±0.02 (10.3 ±0.4) 0.020 ±0.008 (0.5 ±0.2) 0.746 ±0.010 (18.95 ±0.25) 0.007 ±0.005 (0.18 ±0.13)

ORDERING INFORMATION

IN N OVAT ION a nd E X C ELL E N C E ® ® DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 Tel: (508) 339-3000 / Fax: (508) 339-6356 For immediate assistance: (800) 233-2765 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-0075B 10/96 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 Munchen, Germany Tel: 89-544334-0 DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-354-2025 ISO 9001ISO 9001REGISTERED