MAX271ENG(2012) 查看數據表（PDF） - Maxim Integrated

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MAX271ENG
(Rev.:2012)

Digitally-Programmed, Dual 2nd-Order Continuous Lowpass Filter

Maxim Integrated 

MAX270/MAX271

Digitally-Programmed, Dual

2nd-Order Continuous Lowpass Filter

ELECTRICAL CHARACTERISTICS (continued)

(V+ = +5V, V- = -5V; TA = +25NC, unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS

MIN

DYNAMIC FILTER CHARACTERISTICS (MAX270)

Total Harmonic Distortion

Signal Noise Plus Distortion

Spurious-Free Dynamic Range

THD

SINAD

fC code = 44 (2.01kHz typ), VIN = 3.5VP-P at

390.625Hz (Notes 2 and 3)

SFDR

70

UNCOMMITTED AMPLIFIER (MAX270)

Slew Rate

Bandwidth

TRACK AND HOLD (MAX271)

Hold Settling Time

To 0.1% (Note 4)

Acquisition Time

To 0.1% (Note 5)

Hold Step

Droop Rate

TA = TMIN to TMAX

Offset Voltage at T/H OUT

Includes filter offset

-6

T/H OUT Disabled Output Leakage

Current

TA = TMIN to TMAX, VT/H = 0V (Track Mode) -10

Total Harmonic Distortion

Spurious-Free Dynamic Range

THD fC code = 44 (2.01kHz typ), VIN = 3.5VP-P at

390.625Hz, sampling rate = 50kHz

SFDR (Notes 2, 6, 7)

70

TYP MAX UNITS

-70

73

dB

1.2

V/Fs

2

MHz

500

ns

1.8

Fs

1

mV

30

FV/Fs

+6

mV

+10

FA

-70

dB

DIGITAL INPUTS

Digital Input High Voltage

Digital Input Low Voltage

TA = TMIN to TMAX (Note 8)

2.4

V

0.8

Digital Input Current

TA = TMIN to TMAX, digital input held at Q5V,

includes MODE (MAX271)(Note 8)

-1

+1

FA

POWER REQUIREMENTS

Supply Voltage Range

Q2.375

to Q8

V

Supply Current

Shutdown Supply Current

Power-Supply Rejection Ratio at

1kHz

PSRR

TA = TMIN to TMAX (Note 9)

TA = TMIN to TMAX (Note 10)

fC code = 0 (1kHz typ), V+ = 5VDC +

10mVP-P at 1kHz

6.5

mA

15

FA

30

dB

Note 1: All internal amplifiers limited to 2MHz bandwidth.

Note 2: Only filter A tested for these parameters.

Note 3: Spurious-Free Dynamic Range is the ratio of the fundamental to the largest of any harmonic or noise spur in dB.

Note 4: Includes T/H propagation delays. With 5kω, parallel 100pF load.

Note 5: ±2V input step settling 0.1% with 5kω parallel 100pF load.

Note 6: T/H pin toggled at sampling rate, 50% duty cycle.

Note 7: THD and SFDR specifications for T/H include contributions from filter.

Note 8: Digital pins include SHDN, WR, CS, A0, D0–D6 (MAX270) and SHDN, T/H, A/B, WR, T/H EN, CS, A0, A1, D0–D6, T/H

(MAX271).

Note 9: Input of uncommitted op amp disconnected with a 5kω feedback resistor from input to output.

Note 10: WR, CS, A0, D0–D6 held at +5V; VSHDN = 0V (MAX270). WR, CS, A0, A1, D0–D6, T/H, T/H, A/B, T/H, MODE held at

+5V; VSHDN = 0V (MAX271).

Maxim Integrated

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