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參數(shù)資料
| 型號(hào)： | MAX5420BEUA+ |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 6/9頁(yè) |
| 文件大小： | 0K |
| 描述： | IC VOLTAGE DIVIDER DGLT 8-UMAX |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 接片： | 4 |
| 電阻（歐姆）： | 15k |
| 電路數(shù)： | 1 |
| 存儲(chǔ)器類型： | 易失 |
| 接口： | 2 輸入并口 |
| 電源電壓： | 4.75 V ~ 5.25 V，±0.0 V ~ 5.25 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-uMAX |
| 包裝： | 管件 |
MAX5420/MAX5421
Detailed Description
The MAX5420/MAX5421 are digitally programmable pre-
cision voltage dividers for programmable-gain amplifiers.
Operationally, these devices consist of digitally selectable
precision resistor-dividers providing noninverting gains of
1, 2, 4, and 8 for PGA applications (see Functional
Diagram and Figure 1).
The MAX5420/MAX5421 achieve divider ratio accuracy of
0.025% (MAX5420A/MAX5421A), 0.09% (MAX5420B/
MAX5421B) or 0.5% (MAX5420C/MAX5421C).
The end-to-end resistance from H to L is 15k
. The
impedance seen at W is designed to be the same 8k
for divider ratios 2, 4, and 8, ensuring excellent imped-
ance matching and constant switching times. In gain of
+1 configuration, H is internally connected to W with a
typical resistance of 500
.
Matching Resistor (MAX5421)
The MAX5421 includes a matching resistor to compen-
sate for offset voltage due to input bias current of the
op amp. The resistance from MATCH_H to MATCH_L,
equals the resistance seen at W for gains of 2, 4, and 8.
In the gain of +1, an internal switch connects
MATCH_H and MATCH_L. This internal switch matches
the impedance of the switch between H and W.
Digital Interface Operation
The MAX5420/MAX5421 feature a simple two-bit paral-
lel programming interface. D1 and D0 program the
divider ratio setting according to the Logic Control
Truth Table (Table 1). The digital interface is CMOS/TTL
logic compatible.
Applications Information
Programmable-Gain Amplifier
The MAX5420/MAX5421 are ideally suited for high-pre-
cision PGA applications. The typical application circuit
of Figure 3 uses the MAX5421 with matching resistor to
compensate for voltage offset due to op amp input bias
currents. Use the MAX5420 with an ultra-low input bias
current op amp such as the MAX4237 (Figure 4).
Power Supplies and Bypassing
The MAX5420/MAX5421 operate from dual ±5V sup-
plies, or a single +5V supply. For dual supplies, bypass
VDD and VSS with 0.1F ceramic capacitors to GND.
For single supply, connect VSS to GND and bypass
VDD with a 0.1F ceramic capacitor to GND.
Ratio
RB
RA
=+
1
_
Digitally Programmable Precision
Voltage Divider for PGAs
6
_______________________________________________________________________________________
DIGITAL INPUTS
D1
D0
DIVIDER
RATIO
00
1
01
2
10
4
11
8
Table 1. Logic Control Truth Table
PIN
MAX5420
MAX5421
NAME
FUNCTION
11
VDD
Positive Supply Voltage
22
VSS
Negative Supply Voltage
3
GND
Ground
4, 5
D0, D1
Digital Control Inputs. Drive D0 and D1 logic high or logic low to set the divider ratio.
See Logic Control Truth Table.
6
8
L
Low Terminal of Resistor-Divider
7
9
W
Resistor-Divider Output
8
10
H
High Terminal of Resistor-Divider
—
6
MATCH_L
Matching Resistor Low Terminal
—
7
MATCH_H
Matching Resistor High Terminal
Pin Description
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參數(shù)描述 |
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| MAX5420BEUA+ | 功能描述:數(shù)字電位計(jì) IC Precision Voltage Divider for PGAs RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| MAX5420BEUA+T | 功能描述:數(shù)字電位計(jì) IC Precision Voltage Divider for PGAs RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| MAX5420BEUA-T | 功能描述:數(shù)字電位計(jì) IC RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| MAX5420CEUA | 功能描述:數(shù)字電位計(jì) IC RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| MAX5420CEUA+ | 功能描述:數(shù)字電位計(jì) IC Precision Voltage Divider for PGAs RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
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