MAX271：Digitally-Programmed, Dual 2nd-Order Continuous Lowpass Filter

The MAX270/MAX271 are digitally-programmed, dual second-order continuous-time lowpass filters. Their typical dynamic range of 96dB surpasses most switched capacitor filters which require additional filtering to remove clock noise. The MAX270/MAX271 are ideal for anti-aliasing and DAC smoothing applications and can be cascaded for higher-order responses. The two filter sections are independently programmable by either microprocessor (µP) control or pin strapping. Cutoff frequencies in the 1kHz to 25kHz range can be selected. The MAX270 has an on-board, uncommitted op amp, while the MAX271 has an internal track-and-hold (T/H).

Key Features

Continuous-Time Filtering - No Clock Required
Dual 2nd-Order Lowpass Filters
Sections Independently Programmable: 1kHz to 25kHz
96dB Dynamic Range
No External Components
Cascadable for Higher Order
Low-Power Shutdown Mode
Track-and-Hold (MAX271)

MAX270, MAX271: Typical Operating Circuit

Applications/Uses

Anti-Aliasing and Track-and-Hold (MAX271)
Anti-Aliasing Filter
Low-Noise Applications
Lowpass Filtering
Output Smoothing

DataSheet

title	Download file
MAX270-MAX271 Data Sheet	MAX270-MAX271.pdf

Parametrics

Part Number	Filter Sections	Order Per Filter Section	Filter Class	Filter Type	Filter Characteristic	Program Method	Lowest Cutoff (Hz)	Highest Cutoff (kHz)	V_SUPPLY (Dual) (±V)	V_SUPPLY (V)	Oper. Temp. (°C)	Package/Pins	Budgetary Price
Part Number	Filter Sections	Order Per Filter Section	Filter Class	Filter Type	Filter Characteristic	Program Method	max	min	Dual	V_SUPPLY (V)	Oper. Temp. (°C)	Package/Pins	See Notes
MAX270	2	2	Continuous	Lowpass	Chebychev	µP Bus Pin Strap	1000	25	5	5	-55 to +125 -40 to +85 0 to +70	CDIP(N)/20 PDIP(N)/20 SOIC(W)/20	$11.29 @1k
MAX271	2	2	Continuous	Lowpass	Chebychev	µP Bus Pin Strap	1000	25	5	5	-55 to +125 -40 to +85 0 to +70	CDIP(N)/24 PDIP(N)/24 SOIC(W)/24	$11.80 @500

Ordering Information

Part Number	Status	Recommended Replacement	Package	Temp	RoHS
MAX271C/D	No Longer Available	MAX271EWG+	DICE SALES,;NA pin;DICE;	0°C to +70°C	See data sheet
MAX271CNG	No Longer Available	MAX271CNG+	PDIP(N),;24 pin;158.4 mm²	0°C to +70°C	No
MAX271CNG+	Active		PDIP(N),;24 pin;158.4 mm²	0°C to +70°C	Lead Free
MAX271CWG	No Longer Available	MAX271CWG+	SOIC(W),;24 pin;166.1 mm²	0°C to +70°C	No
MAX271CWG+	Active		SOIC(W),;24 pin;166.1 mm²	0°C to +70°C	Lead Free
MAX271CWG+T	Active		SOIC(W),;24 pin;166.1 mm²	0°C to +70°C	Lead Free
MAX271CWG-T	No Longer Available	MAX271CWG+T	W.SO;24 pin	0°C to +70°C	See data sheet
MAX271ENG	No Longer Available	MAX271ENG+	PDIP(N),;24 pin;158.4 mm²	-40°C to +85°C	No
MAX271ENG+	Active		PDIP(N),;24 pin;158.4 mm²	-40°C to +85°C	Lead Free
MAX271EWG	No Longer Available	MAX271EWG+	SOIC(W),;24 pin;166.1 mm²	-40°C to +85°C	No
Part Number	Status	Recommended Replacement	Package	Temp	RoHS
MAX271EWG+	Active		SOIC(W),;24 pin;166.1 mm²	-40°C to +85°C	Lead Free
MAX271EWG+T	Active		SOIC(W),;24 pin;166.1 mm²	-40°C to +85°C	Lead Free
MAX271EWG-T	No Longer Available	MAX271EWG+T	W.SO;24 pin	-40°C to +85°C	See data sheet
MAX271MRG	No Longer Available		CDIP(N),;24 pin;264.3 mm²	-55°C to +125°C	No

MAX270-MAX271.pdf MAX271