Datasheet AD7720 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | CMOS Sigma-Delta Modulator with 90 dB Dynamic Range |
| Pages / Page | 17 / 4 — AD7720. Parameter. B Version. Units. Test Conditions/Comments. 90.625kHz. … |
| File Format / Size | PDF / 271 Kb |
| Document Language | English |
AD7720. Parameter. B Version. Units. Test Conditions/Comments. 90.625kHz. BIT STREAM. DECIMATE. 16-BIT. BY 32. BY 2. OUTPUT. 120dB. 90dB. FILTER 1
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Text Version of Document
AD7720 Parameter B Version Units Test Conditions/Comments
LOGIC INPUTS VIH, Input High Voltage 2 V min VIL, Input Low Voltage 0.8 V max IINH, Input Current 10 µA max CIN, Input Capacitance 10 pF max LOGIC OUTPUTS VOH, Output High Voltage 2.4 V min |IOUT| ≤ 200 µA VOL, Output Low Voltage 0.4 V max |IOUT| ≤ 1.6 mA POWER SUPPLIES AVDD 4.75/5.25 V min/V max DVDD 4.75/5.25 V min/V max IDD (Total for AVDD, DVDD) Digital Inputs Equal to 0 V or DVDD Active Mode 43 mA max Standby Mode 25 µA max NOTES 1Operating temperature range is as follows: B Version: –40°C to +85°C. 2Gain Error excludes reference error. The modulator gain is calibrated w.r.t. the voltage on the REF2 pin. 3Applies after calibration at temperature of interest. 4Measurement Bandwidth = 0.5 × fMCLK; Input Level = –0.05 dB. 5TA = +25°C to +85°C/TA = TMIN to TMAX. Specifications subject to change without notice.
90.625kHz 90.625kHz BIT STREAM DECIMATE DECIMATE 16-BIT BY 32 BY 2 OUTPUT 120dB 90dB FILTER 1 292.969kHz FILTER 2 104.687kHz BANDWIDTH = 90.625 kHz BANDWIDTH = 90.625 kHz TRANSITION = 292.969kHz TRANSITION = 104.687kHz ATTENUATION = 120dB ATTENUATION = 90dB COEFFICIENTS = 384 COEFFICIENTS = 151
Figure 1. Digital Filter (Consists of 2 FIR Filters). This filter is implemented on the AD7722. REV. 0 –3–
LOGIC INPUTS VIH, Input High Voltage 2 V min VIL, Input Low Voltage 0.8 V max IINH, Input Current 10 µA max CIN, Input Capacitance 10 pF max LOGIC OUTPUTS VOH, Output High Voltage 2.4 V min |IOUT| ≤ 200 µA VOL, Output Low Voltage 0.4 V max |IOUT| ≤ 1.6 mA POWER SUPPLIES AVDD 4.75/5.25 V min/V max DVDD 4.75/5.25 V min/V max IDD (Total for AVDD, DVDD) Digital Inputs Equal to 0 V or DVDD Active Mode 43 mA max Standby Mode 25 µA max NOTES 1Operating temperature range is as follows: B Version: –40°C to +85°C. 2Gain Error excludes reference error. The modulator gain is calibrated w.r.t. the voltage on the REF2 pin. 3Applies after calibration at temperature of interest. 4Measurement Bandwidth = 0.5 × fMCLK; Input Level = –0.05 dB. 5TA = +25°C to +85°C/TA = TMIN to TMAX. Specifications subject to change without notice.
90.625kHz 90.625kHz BIT STREAM DECIMATE DECIMATE 16-BIT BY 32 BY 2 OUTPUT 120dB 90dB FILTER 1 292.969kHz FILTER 2 104.687kHz BANDWIDTH = 90.625 kHz BANDWIDTH = 90.625 kHz TRANSITION = 292.969kHz TRANSITION = 104.687kHz ATTENUATION = 120dB ATTENUATION = 90dB COEFFICIENTS = 384 COEFFICIENTS = 151
Figure 1. Digital Filter (Consists of 2 FIR Filters). This filter is implemented on the AD7722. REV. 0 –3–
