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參數(shù)資料
| 型號(hào)： | MAX9939AUB+T |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 13/15頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP PGA SPI VOS I/O 10MSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 放大器類型： | 可編程增益 |
| 電路數(shù)： | 2 |
| 輸出類型： | 差分 |
| 轉(zhuǎn)換速率： | 9 V/µs |
| 增益帶寬積： | 2.15MHz |
| 電流 - 輸入偏壓： | 1pA |
| 電壓 - 輸入偏移： | 1500µV |
| 電流 - 電源： | 3.4mA |
| 電流 - 輸出 / 通道： | 70mA |
| 電壓 - 電源，單路/雙路(±)： | 2.9 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 10-µMAX |
| 包裝： | 帶卷 (TR) |
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Detailed Description
The MAX9939 is a general-purpose PGA with input off-
set trim capability. Its gain and input offset voltage
(VOS) are SPI programmable. The device also includes
an uncommitted output operational amplifier that can
be used as either a high-order active filter or to provide
a differential output. The device can be put into shut-
down through SPI.
The gain of the amplifier is programmable between
0.2V/V and 157V/V. The input offset is programmable
between ±17mV and can be used to regain output
dynamic range in high gain settings. An input offset-volt-
age measurement mode enables input offset voltage to
be calibrated out in firmware to obtain excellent DC
accuracy.
The main amplifier accepts a differential input and pro-
vides a single-ended output. The relationship between
the differential input and singled-ended output is given
by the representative equation:
VOUTA = VCC/2 - Gain x (VINA+ - VINA-) + Gain x VOS
Architecture
The MAX9939 features three internal amplifiers as
shown in the
Functional Diagram. The first amplifier
(amplifier LVL) is configured as a differential amplifier
for differential to single-ended conversion with an input
offset-voltage trim network. It has extremely high
Typical Operating Characteristics (continued)
(VCC = 5V, VGND = 0V, VIN+ = VIN- = 0V, Gain = 10V/V, ROUTA = ROUTB = 1k to VCC/2, TA = +25°C, unless otherwise noted.)
Pin Description
PIN
NAME
FUNCTION
1
SCLK
Serial-Clock Input
2
DIN
Serial-Data Input. Data is clocked into the serial interface on the rising edge of SCLK.
3
GND
Ground
4
INA-
PGA Inverting Input
5
INA+
PGA Noninverting Input
6
OUTB
Buffer Output
7
INB
Buffer Input
8
OUTA
PGA Output
9VCC
Power Supply. Bypass to GND with 0.1F and 1F capacitors.
10
CS
Active-Low Chip-Select Input. Drive
CS low to enable the serial interface. Drive CS high to disable the serial interface.
MAX9939
SPI Programmable-Gain Amplifier
with Input VOS Trim and Output Op Amp
7
Maxim Integrated
200
s/div
COMMON-MODE REJECTION RESPONSE
INA+
1V/div
INA-
1V/div
MAX9939 toc19
OUTA
2V/div
VCM = 1VP-P, 1kHz
VDM = 25mVP-P, 10kHz
GAIN = 157V/V
SHUTDOWN CURRENT vs. SUPPLY VOLTAGE
MAX9939
toc20
VOLTAGE (V)
SHUTDOWN
CURRENT
(
A)
3.6
4.0
16
20
8
4
12
0
2.8
3.2
4.8
5.2
4.4
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