Datasheet AD7724 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | Dual, 7th-Order, Sigma-Delta Modulator |
| Pages / Page | 17 / 4 — AD7724. Parameter. A Version. Unit. Test Conditions/Comments. 94.25kHz. … |
| Revision | B |
| File Format / Size | PDF / 322 Kb |
| Document Language | English |
AD7724. Parameter. A Version. Unit. Test Conditions/Comments. 94.25kHz. BIT STREAM. DECIMATE. 16-BIT. BY 32. BY 2. OUTPUT. 120dB. 90dB. FILTER 1
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AD7724 Parameter A Version Unit Test Conditions/Comments
LOGIC OUTPUTS VOH, Output High Voltage DVDD1 – 0.2 V min |IOUT| ≤ 200 µA VOL, Output Low Voltage 0.4 V max |IOUT| ≤ 1.6 mA POWER SUPPLIES AVDD/DVDD 4.75/5.25 V min/V max DVDD1 2.85/5.25 V min/V max IDD (Total for AVDD, DVDD) Digital Inputs Equal to 0 V or DVDD Active Mode 60 mA max Standby Mode 20 µA max NOTES 1Operating temperature range is as follows: A Version: –40°C to +85°C. 2Gain Error excludes reference error. The modulator gain is calibrated wrt the voltage on the REF2 pin. 3Measurement Bandwidth = 0.5 × fMCLK; Input Level = –0.05 dB. 4When a square wave clock is used, the dynamic specifications will degrade by 1 dB typically. Specifications subject to change without notice.
94.25kHz 94.25kHz BIT STREAM DECIMATE DECIMATE 16-BIT BY 32 BY 2 OUTPUT 120dB 90dB FILTER 1 304.687kHz FILTER 2 108.874kHz BANDWIDTH = 94.25kHz BANDWIDTH = 94.25kHz TRANSITION = 304.687kHz TRANSITION = 108.874kHz ATTENUATION = 120dB ATTENUATION = 90dB COEFFICIENTS = 384 COEFFICIENTS = 151
Figure 1. Digital Filter (Consists of Two FIR Filters). This Filter is Implemented on the AD7722. REV. B –3–
LOGIC OUTPUTS VOH, Output High Voltage DVDD1 – 0.2 V min |IOUT| ≤ 200 µA VOL, Output Low Voltage 0.4 V max |IOUT| ≤ 1.6 mA POWER SUPPLIES AVDD/DVDD 4.75/5.25 V min/V max DVDD1 2.85/5.25 V min/V max IDD (Total for AVDD, DVDD) Digital Inputs Equal to 0 V or DVDD Active Mode 60 mA max Standby Mode 20 µA max NOTES 1Operating temperature range is as follows: A Version: –40°C to +85°C. 2Gain Error excludes reference error. The modulator gain is calibrated wrt the voltage on the REF2 pin. 3Measurement Bandwidth = 0.5 × fMCLK; Input Level = –0.05 dB. 4When a square wave clock is used, the dynamic specifications will degrade by 1 dB typically. Specifications subject to change without notice.
94.25kHz 94.25kHz BIT STREAM DECIMATE DECIMATE 16-BIT BY 32 BY 2 OUTPUT 120dB 90dB FILTER 1 304.687kHz FILTER 2 108.874kHz BANDWIDTH = 94.25kHz BANDWIDTH = 94.25kHz TRANSITION = 304.687kHz TRANSITION = 108.874kHz ATTENUATION = 120dB ATTENUATION = 90dB COEFFICIENTS = 384 COEFFICIENTS = 151
Figure 1. Digital Filter (Consists of Two FIR Filters). This Filter is Implemented on the AD7722. REV. B –3–
