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LTC1657 Datasheet(PDF) 3 Page - Linear Technology |
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LTC1657 Datasheet(HTML) 3 Page - Linear Technology |
3 / 12 page 3 LTC1657 The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 4.5V to 5.5V, VOUT unloaded, REFOUT tied to REFHI, REFLO tied to GND, X1/X2 tied to GND, unless otherwise noted. ELECTRICAL CHARACTERISTICS Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: External reference REFHI = 2.2V. VCC = 5V. Note 3: Nonlinearity is defined from code 128 to code 65535 (full scale). See Applications Information. Note 4: Digital inputs at 0V or VCC. Note 5: DAC switched between all 1s and all 0s. Note 6: Guaranteed by design. Not subject to test. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS AC Performance Voltage Output Slew Rate (Note 5) q ±0.3 ±0.7 V/ µs Voltage Output Settling Time (Note 5) to 0.0015% (16-Bit Settling Time) 20 µs (Note 5) to 0.012% (13-Bit Settling Time) 10 µs Digital Feedthrough 0.3 nV •s Midscale Glitch Impulse DAC Switch Between 8000H and 7FFFH 8nV •s Output Voltage Noise Spectral Density At 1kHz 250 nV/ √Hz Digital I/O VIH Digital Input High Voltage q 2.4 V VIL Digital Input Low Voltage q 0.8 V VOH Digital Output High Voltage q VCC – 1 V VOL Digital Output Low Voltage q 0.4 V ILEAK Digital Input Leakage VIN = GND to VCC q ±10 µA CIN Digital Input Capacitance (Note 6) 10 pF Switching Characteristics tCS CS (MSB or LSB) Pulse Width q 40 ns tWR WR Pulse Width q 40 ns tCWS CS to WR Setup q 0ns tCWH CS to WR Hold q 0ns tDWS Data Valid to WR Setup q 40 ns tDWH Data Valid to WR Hold q 0ns tLDAC LDAC Pulse Width q 40 ns tCLR CLR Pulse Width q 40 ns Reference Output (REFOUT) Reference Output Voltage q 2.036 2.048 2.060 V Reference Output 15 ppm/ °C Temperature Coefficient Reference Line Regulation VCC = 4.5V to 5.5V q ±1.5 mV/V Reference Load Regulation Measured at IOUT = 100µA q 5 mV/A Short-Circuit Current REFOUT Shorted to GND q 50 100 mA Reference Input REFHI, REFLO Input Range (Note 6) See Applications Information X1/X2 Tied to VOUT q 0VCC – 1.5 V X1/X2 Tied to GND q 0VCC/2 V REFHI Input Resistance q 16 25 k Ω |
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