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データシートサーチシステム |
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データシートサーチシステム |
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ADC-228 データシート(PDF) 3 Page - List of Unclassifed Manufacturers |
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ADC-228 データシート(HTML) 3 Page - List of Unclassifed Manufacturers |
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3 / 4 page  ® ® ADC-228 Table 2. ADC-228 Bipolar Output Coding (Assumes analog input is externally offset) 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. 3. DATEL uses conservative definitions when specifying integral linearity (end-point) and differential linearity (code transition). The specifications using the less conservative definitions have also been provided as a comparative specification for products specified this way. 4. Single conversions (one-shot mode) would require another clock edge to read out data. Users desiring to provide just a single clock pulse could use the circuit shown in Figure 2 to obtain the data. STRAIGHT BIN. COMP. BIN. ANALOG NMINV = 0 NMINV = 1 INPUT CODE NLINV = 0 NLINV = 1 +4.96V +FS – 1 LSB 1111 1110 0000 0001 +3.75V + 3/4 FS 1100 0000 0011 1111 +2.50V + 1/2 FS 1000 0000 0111 1111 +1.25V + 1/4 FS 0100 0000 1011 1111 +0.02V + 1 LSB 0000 0001 1111 1110 0.00V ZERO 0000 0000 1111 1111 Table 1. ADC-228 Unipolar Output Coding TWO’S COMP. COMP. TWO’S COMP. ANALOG NMINV = 1 NMINV = 0 INPUT CODE NLINV = 0 NLINV = 1 +2.480V +FS – 1 LSB 0111 1111 1000 0000 +1.250V +1/2 FS 0100 0000 1011 1111 +0.020V +1 LSB 0000 0001 1111 1110 +0.000V ZERO 0000 0000 1111 1111 –1.250V –1/2 FS 1100 0000 0011 1111 –2.480V –FS + 1 LSB 1000 0001 0111 1110 –2.500V –FS 1000 0000 0111 1111 CLOCK OUT 74HC86 CLOCK IN 100pF 50ns 40ns 25ns PULSES DATA N SAMPLED DATA N VALID 250 Ω Figure 3. ADC-228 Typical Connections Figure 2. ADC-228 Single Clock Pulse Circuit and Operation 24 23 B8 (LSB) B7 9k Ω 51 Ω 19 VIN 5 +15V *Optional + 2, 4, 6, 7 +5V REFERENCE OUT NO CONNECTION 3 13, 20 22 B6 21 B5 17 B4 16 B3 CS1 12 CLOCK 18 ANALOG INPUT 15 B2 14 + + B1 (MSB) 4.7µF NLINV 8 NMINV 9 0.1µF 10 1 –15V +5V CS1 11 * Use optional resistor only if amp is not used to drive input. ADC-228 + 0.1µF 0.1µF 0.1µF 4.7µF 4.7µF 4.7µF EE R = V /1.667mA 3 |
同様の部品番号 - ADC-228 |
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同様の説明 - ADC-228 |
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