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| 型号： | MAX271CWG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC FILTER LOWPASS PROG 24-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 30 |
| 滤波器类型： | 连续时间低通 |
| 频率 - 截止或中心： | 25kHz |
| 滤波器数： | 2 |
| 滤波器阶数： | 2nd |
| 电源电压： | 4.74 V ~ 16 V，±2.37 V ~ 8 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 管件 |
6
Maxim Integrated
Digitally-Programmed, Dual
2nd-Order Continuous Lowpass Filter
MAX270/MAX271
Pin Description
Detailed Description
Figures 1a, 1b, and 1c show the MAX270/MAX271 func-
tional diagrams. Both the MAX270 and MAX271 contain
two independent, second-order, Sallen-Key, lowpass
filter sections, A and B to provide a frequency vs. gain
rolloff of approximately 40dB/decade. These are not
switched-capacitor filters, but have a continuous-time
design similar to discrete active filters built around op
amps. The MAX270/MAX271 eliminate clock noise and
aliasing problems which limit low-noise performance of
switched-capacitor filters; resulting dynamic range is
over 96dB.
Each filter section contains two banks of programmable
capacitors, controlled by an internal 7-bit memory, which
set filter cutoff frequencies (fC) from 1kHz to 25kHz. The
filters provide two program modes. In FP mode, cutoff
frequencies are programmed by writing 7-bit data to one
of two memory addresses (one for each filter section).
Alternately, a pin-strap programming mode programs
both filter sections simultaneously. In this mode, both
memory latches are transparent (not addressable), and
data pins D0–D6 may be pin-strapped (hard-wired) to
set a common fC for both filter sections.
The filters are trimmed at the wafer level, setting 0 for
a maximum of 0.15dB passband peaking for fC pro-
grammed to 1kHz. Maximum passband peaking at other
codes is typically less than 0.15dB. Filter Q is not user-
programmable.
The MAX270 includes an uncommitted op amp (nonin-
verting input grounded); the MAX271 has an on-chip T/H
that tracks and holds the output of either filter section
(selectable). The held output is provided at T/H OUT. T/H
functions are controlled by writing control bits to internal
registers (in FP mode) or by control pins directly (in pin-
strap mode).
The MAX270 and MAX271 provide a low quiescent cur-
rent shutdown mode controlled by the SHDN pin, which
turns off internal amplifiers and disconnects all outputs,
reducing quiescent operating current to less than 15FA.
When the MAX271 is in FP mode, shutdown mode is
selected by writing control bits to memory (the SHDN
pin is disabled).
MAX270
Note: All digital input levels are TTL and CMOS compatible,
unless otherwise noted.
PIN
NAME
FUNCTION
1
OP OUT
Uncommitted Op Amp Output
2
V+
Positive Supply Voltage
3
OUTA
Filter A Output
4
SHDN
Shutdown Control. Low level
disconnects OUTA, OUTB, and OP OUT
and places device into shutdown mode.
5
INA
Filter A Input
6
V-
Negative Supply Voltage
7
INB
Filter B Input
8
OUTB
Filter B Output
9
GND
Ground
10
WR
Write Control Input. A low level writes
data D0–D6 to program memory
addressed by A0. High level latches
data.
11
CS
Chip-Select Input. Must be low for WR
input to be recognized.
12
A0
Three-Level Address Input
Logic High: Addresses filter A
Logic Low: Addresses filter B
Connect to V-: Pin-strap mode
13-
19
D0–D6
7-Bit Data Inputs. Allows programming
of 128 cutoff frequencies in a 1kHz to
25kHz range.
20
OP IN
Uncommitted Op Amp Input
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX271CWG+ | 功能描述:有源滤波器 Digitally Prog Dual 2-ORD Cont Lowpass RoHS:否 制造商:Maxim Integrated 通道数量:1 截止频率:150 KHz 电源电压-最大:11 V 电源电压-最小:4.74 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:PDIP N 封装:Tube |
| MAX271CWG+T | 功能描述:有源滤波器 Digitally Prog Dual 2-ORD Cont Lowpass RoHS:否 制造商:Maxim Integrated 通道数量:1 截止频率:150 KHz 电源电压-最大:11 V 电源电压-最小:4.74 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:PDIP N 封装:Tube |
| MAX271CWG-T | 功能描述:有源滤波器 RoHS:否 制造商:Maxim Integrated 通道数量:1 截止频率:150 KHz 电源电压-最大:11 V 电源电压-最小:4.74 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:PDIP N 封装:Tube |
| MAX271ENG | 功能描述:有源滤波器 Integrated Circuits (ICs) RoHS:否 制造商:Maxim Integrated 通道数量:1 截止频率:150 KHz 电源电压-最大:11 V 电源电压-最小:4.74 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:PDIP N 封装:Tube |
| MAX271ENG+ | 功能描述:有源滤波器 Digitally Prog Dual 2-ORD Cont Lowpass RoHS:否 制造商:Maxim Integrated 通道数量:1 截止频率:150 KHz 电源电压-最大:11 V 电源电压-最小:4.74 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:PDIP N 封装:Tube |
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