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ADC-228AMM Datasheet(PDF) 3 Page - Murata Power Solutions Inc. |
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ADC-228AMM Datasheet(HTML) 3 Page - Murata Power Solutions Inc. |
3 / 4 page 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. ANALOG INPUT CODE STRAIGHT BIN. +4.96V +FS – 1 LSB 1111 1110 +3.75V + 3/4 FS 1100 0000 +2.50V + 1/2 FS 1000 0000 +1.25V + 1/4 FS 0100 0000 +0.02V + 1 LSB 0000 0001 0.00V ZERO 0000 0000 Table 1. ADC-228A Unipolar Output Coding Table 2. Chip Select Truth Table CS2 Pin 12 CS1 Pin 11 Bits 1-8 0 0 Three State Mode 0 1 Three State Mode 1 0 Data Outputted 1 1 Three State Mode Figure 2. ADC-228A Timing Diagram SAMPLE N + 2 SAMPLE N + 1 SAMPLE N OUTPUT HOLD TIME DATA N DATA N + 1 DATA N + 2 CLOCK DIGITAL OUTPUT OUTPUT DELAY Figure 3. ADC-228A Typical Connections 24 23 B8 (LSB) B7 9k Ω 51 Ω 19 VIN 5 +15V *Optional + 2, 4, 6, 7 +5V REFERENCE OUT NO CONNECTION 3 8, 9, 13, 20 22 B6 21 B5 17 B4 16 B3 CS1 12 CLOCK 18 ANALOG INPUT 15 B2 14 + + B1 (MSB) 4.7μF 0.1μF 10 1 –15V +5V CS1 11 * Use optional resistor only if amp is not used to drive input. ADC-228A + 0.1μF 0.1μF 0.1μF 4.7μF 4.7μF 4.7μF EE R = V /1.667mA ADC-228A 8-Bit, 20MHz, Complete Flash A/D Converter MDA_ADC-228A.B01 Page 3 of 4 Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com |
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