AD7866 데이터 시트보기 (PDF) - Analog Devices

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AD7866

Dual 1 MSPS, 12-Bit, 2-Channel SAR ADC with Serial Interface

Analog Devices 

AD7866

PERFORMANCE CURVES

TPC 1 shows a typical FFT plot for the AD7866 at 1 MHz

sample rate and 300 kHz input frequency. TPC 2 shows the

signal-to-(noise + distortion) ratio performance versus input

frequency for various supply voltages while sampling at 1 MSPS

with an SCLK of 20 MHz.

TPCs 3a to 4b show the power supply rejection ratio versus

AVDD supply ripple frequency for the AD7866 under different

conditions. The power supply rejection ratio (PSRR) is defined

as the ratio of the power in the ADC output at full-scale fre-

quency f, to the power of a 100 mV sine wave applied to the

ADC AVDD supply of frequency fS:

PSRR (dB) = 10 log (Pf PfS )

Pf = power at frequency f in ADC output, and PfS = power at

frequency fS coupled onto the ADC AVDD supply. Here, a 100 mV

peak-to-peak sine wave is coupled onto the AVDD supply while the

digital supply is left unaltered. TPCs 3a and 3b show the PSRR

of the AD7866 when there is no decoupling on the supply, while

TPCs 4a and 4b show the PSRR with decoupling capacitors

of 10 µF and 0.1 µF on the supply.

TPCs 5 and 6 show typical DNL and INL plots for the AD7866.

TPC 7 shows a graph of the total harmonic distortion versus

analog input frequency for various source impedances.

TPC 8 shows a graph of total harmonic distortion versus analog

input frequency for various supply voltages. See the Analog

Input section.

Typical Performance Characteristics

0

4098 POINT FFT

fSAMPLE = 1MSPS

–15 fIN = 300kHz

SNR = 70.31dB

THD = –85.47dB

–35 SFDR = –86.64dB

–55

–75

–95

–115

0

50 100 150 200 250 300 350 400 450 500

FREQUENCY – kHz

TPC 1. Dynamic Performance

–61

TA = 25 C

–63

–65

VDD = VDRIVE = 2.7V

–67

VDD = VDRIVE = 3.6V

–69

–71

VDD = VDRIVE = 5.25V

VDD = VDRIVE = 4.75V

–73

–75

10k

100k

1M

INPUT FREQUENCY – Hz

TPC 2. SINAD vs. Input Frequency

0

100mV p-p SINE WAVE ON AVDD

–10 2.5V EXT REFERENCE ON VREF

–20 TA = 25؇C

–30

–40

–50

VDD = 2.7V

VDD = 5.25V

–60

–70

–80

VDD = 4.75V

–90

VDD = 3.6V

–100

1k

10k

100k

1M

AVDD RIPPLE FREQUENCY – Hz

TPC 3a. PSRR vs. Supply Ripple Frequency,

without Supply Decoupling

0

100mV p-p SINE WAVE ON AVDD

–10 2.5V EXT REFERENCE ON DCAPA, DCAPB

TA = 25؇C

–20

–30

–40

–50

VDD = 5.25V

–60

VDD = 2.7V

–70

–80

–90

VDD = 4.75V

–100

VDD = 3.6V

1k

10k

100k

1M

AVDD RIPPLE FREQUENCY – Hz

TPC 3b. PSRR vs. Supply Ripple Frequency,

without Supply Decoupling

REV. A

–9–

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