LMP92064 Datasheet, PDF (1/23 Pages) Texas Instruments – Precision Low-Side, 125 kSps Simultaneous Sampling,Current Sensor and Voltage Monitor with SPI

LMP92064
www.ti.com
SNOSCX0 – JUNE 2013
Precision Low-Side, 125 kSps Simultaneous Sampling,
Current Sensor and Voltage Monitor with SPI
Check for Samples: LMP92064
FEATURES
1
• Two Simultaneous Sampling 12-bit ADCs
– Conversion Rate: 125 kSps (Min)
• 12-bit Current Sense Channel
– Input-referred Offset: ±15 μV
– Common-mode Voltage Range: –0.2V to 2V
– Maximum Differential Input Voltage: +75 mV
– Fixed Gain: 25 V/V
– Gain Error: ±0.75 % (Max)
– Bandwidth (–3dB): 70 kHz
– DC PSRR: 100 dB
– DC CMRR: 110 dB
• 12-bit Voltage Channel
– INL: ±1LSB
– Offset Error: ±2 mV (Max)
– Gain Error: ±0.75% (Max)
– Maximum Input Voltage: +2.048V
– Bandwidth: 100 kHz
• Internal Reference
• SPI Frequency: Up to 20 MHz
• Temperature Range: –40°C to +105°C
• WSON-16 Package
APPLICATIONS
• Enterprise Servers
• Telecommunications
• Power Management
DESCRIPTION
The LMP92064 is a precision low-side digital current
sensor and voltage monitor with a digital SPI
interface. This analog front-end (AFE) includes a
precision current sense amplifier to measure a load
current across a shunt resistor and a buffered voltage
channel to measure the voltage supply of the load.
The current and voltage channels are sampled
simultaneously by independent 125 kSps 12-bit ADC
converters, allowing for very accurate power
calculations in unidirectional sensing applications.
The LMP92064 includes an internal 2.048V reference
for the ADCs, eliminating the need of an external
reference and reducing component count and board
space.
A host can communicate with the LMP92064 using a
four-wire SPI interface running at speeds of up to 20
MHz. The fast SPI interface allows the user to take
advantage of the higher bandwidth ADC to capture
fast varying signals. The four-wire interface with
dedicated unidirectional input and output lines also
allows for an easy interface to digital isolators in
applications where isolation is required.
The LMP92064 operates from a single 4.5V to 5.5V
supply and includes a separate digital supply pin. The
LMP92064 is specified over a temperature range of
–40°C to 105°C, and is available in a 5mm x 4mm
WSON-16 package.
+
48V
-
LOAD
R_SENSE
R_DIVIDE2
R_DIVIDE1
INCP ^{VDD VDIG}
INCN
INVP
INVG
LMP92064
GND DGND
SPI Bus
System
Management
Control Unit
+
- ^5V
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated