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SP7800AKS Datasheet(PDF) 7 Page - Sipex Corporation |
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SP7800AKS Datasheet(HTML) 7 Page - Sipex Corporation |
7 / 13 page SP7800ADS/02 SP7800A 12-Bit 3 µs Sampling A/D Converter © Copyright 2000 Sipex Corporation 7 INPUT VOLTAGE RANGE AND LSB VALUES Input Voltage Range Defined As: ±10V ±5V Analog Input Connected to Pin 1 2 Pin Connected to GND 2 1 One Least Significant Bit (LSB) FSR/212 20V/212 10V/212 4.88mV 2.44mV OUTPUT TRANSITION VALUES FFEH TO FFFH + FULL SCALE +10V–3/2LSB +5V–3/2LSB +9.9927V +4.9963V 7FFH TO 800H Mid Scale 0V–1/2LSB 0V–1/2LSB (Bipolar Zero) –2.44mV –1.22mV 000H to 001H –Full Scale –10V+1/2LSB –5V+1/2LSB -9.9976V -4.9988V Table 2. Input Voltages, Transition Voltages and LSB Values ±5V Range Offset and Gain Offset — Apply 1.5637V to the ±5V input at pin 2. Adjust the offset potentiometer until the LSB toggles on and off at code 1010 1000 0000 BIN = A80 H = 2688DEC. Gain — Apply 4.9963V to the ±5V input at pin 2. Adjust the gain potentiometer until the LSB toggles on and off at code 1111 1111 1110 BIN = FFE H = 4094DEC. ±10V Range Offset and Gain Offset — Apply 1.2622V to the ±10V input at pin 1. Adjust the offset potentiometer until the LSB toggles on and off at code 100100000010 BIN = 902 H = 2306DEC. Gain — Apply 9.9927V to the ±10V input at pin 1. Adjust the gain potentiometer until the LSB Figure 3. a) ±10V Range b) ±5V Range — With External Trims toggles on and off at code 1111 1111 1110 BIN = FFE H = 4094DEC. Layout Considerations Because of the high resolution and linearity of the SP7800A, system design problems such as ground path resistance and contact resistance become very important. The input resistance of the SP7800A is 6.3k Ω or 4.2K Ω (for the ±10V and ±5V ranges respectively). To avoid introducing distortion, the source resistance must be very low, or constant with signal level. The output impedance provided by most op amps is ideal. Pins23(V SD)and24(VSA)arenotconnectedinternally on the SP7800A, to maximize accuracy on the chip. They should be connected together as close as pos- sible to the unit. Pin 24 may be slightly more sensitive than pin 23 to supply variations, but to maintain SP7800A 1 2 3 4 5 6 7 R2=100Ω ±10V Input GAIN ADJUST 100 Ω 10K Ω BIPOLAR ZERO ADJUST R1=10KΩ 499 Ω∗ ∗ These resistors are different than those used with the ADS7800 Application Note. These values will work with both the SP7800A and ADS7800. –15V +5V SP7800A 1 2 3 4 5 6 7 GAIN ADJUST R2=100Ω ±5V Input R1=10KW +5V –15V 1K Ω∗ 30.1K Ω 301 Ω a) b) |
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