Datasheet AD7923 (Analog Devices) - 9

AD7923 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS –50 4096 POINT FFT –10 fSAMPLE = 200kSPS AVDD = 4.75V T f –55 A = 25
°
C SAMPLE = 200kSPS RANGE = 0V TO REF f IN IN = 50 kHz –30 SINAD = 70.714dB –60 THD = –82.853dB SFDR = –84.815dB –65 –50 –70 AVDD = VDRIVE = 2.7V SNR (dB) THD (dB) –70 –75 AVDD = VDRIVE = 3.6V –80 –90 –85 AVDD = VDRIVE = 4.75V AV –110 DD = VDRIVE = 5.25V
03096-004
–90
03086-007
0 10 20 30 40 50 60 70 80 90 100 10 100 FREQUENCY (kHz) INPUT FREQUENCY (kHz)
Figure 4. Dynamic Performance at 200 kSPS Figure 7. THD vs. Analog Input Frequency for Various Supply Voltages at 200 kSPS
75 –55 fSAMPLE = 200kSPS –60 TA = 25
°
C AV AV DD = VDRIVE = 5.25V DD = 5.25V AV RANGE = 0V TO REF DD = VDRIVE = 4.75V IN –65 70 –70 RIN = 1000
Ω
AVDD = VDRIVE = 3.6V AV –75 DD = VDRIVE = 2.7V THD (dB) SINAD (dB) –80 RIN = 100
Ω
65 RIN = 10
Ω
–85 fSAMPLE = 200kSPS TA = 25
°
C –90 RANGE = 0V TO REFIN RIN = 50
Ω
60
03086-005
–95
03086-008
0 100 10 100 INPUT FREQUENCY (kHz) INPUT FREQUENCY (kHz)
Figure 5. SINAD vs. Analog Input Frequency for Various Supply Voltages at Figure 8. THD vs. Analog Input Frequency for Various Source Impedances 200 kSPS
0 1.0 AV AV DD = 5V DD = VDRIVE = 5V TEMP = 25
°
C –10 0.8 200mV p-p SINE WAVE ON AVDD REFIN = 2.5V, 1
µ
F CAPACITOR 0.6 –20 TA = 25
°
C 0.4 –30 0.2 –40 0 –50 PSRR (dB) –0.2 –60 INL ERROR (LSB) –0.4 –70 –0.6 –80 –0.8 –90
03086-006
–1.0
03096-009
0 20 40 60 80 100 120 140 160 180 200 0 512 1024 1536 2048 2560 3072 3584 4096 SUPPLY RIPPLE FREQUENCY (kHz) CODE
Figure 6. PSRR vs. Supply Ripple Frequency Figure 9. Typical INL Rev. D | Page 8 of 24 Document Outline Specifications Timing Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Description Typical Performance Characteristics Terminology Control Register Descriptions Sequencer Operation Theory of Operation Circuit Information Converter Operation Analog Input ADC Transfer Function Handling Bipolar Input Signals Typical Connection Diagram Analog Input Selection Digital Inputs VDRIVE Reference Modes of Operation Normal Mode (PM1 = PM0 = 1) Full Shutdown (PM1 = 1, PM0 = 0) Auto Shutdown (PM1 = 0, PM0 = 1) Powering Up the AD7923 Power vs. Throughput Rate Serial Interface Writing Between Conversions Microprocessor Interfacing AD7923-to-TMS320C541 AD7923-to-ADSP-21xx AD7923-to-DSP563xx Application Hints Grounding and Layout Outline Dimensions Ordering Guide Automotive Products