LMP92064_15 Datasheet, PDF (1/29 Pages) Texas Instruments – LMP92064 Precision Low-Side, 125-kSps Simultaneous Sampling,Current Sensor and Voltage Monitor With SPI

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LMP92064
SNOSCX0A – JUNE 2013 – REVISED DECEMBER 2014
LMP92064 Precision Low-Side, 125-kSps Simultaneous Sampling,
Current Sensor and Voltage Monitor With SPI
1 Features
•1 Two Simultaneous Sampling 12-Bit ADCs
– Conversion Rate: 125 kSps (Minimum)
• 12-Bit Current Sense Channel
– Input-referred Offset: ±15 μV
– Common-mode Voltage Range: –0.2 V to 2 V
– Maximum Differential Input Voltage: 75 mV
– Fixed Gain: 25 V/V
– Gain Error: ±0.75% (Maximum)
– Bandwidth (–3dB): 70 kHz
– DC PSRR: 100 dB
– DC CMRR: 110 dB
• 12-Bit Voltage Channel
– INL: ±1 LSB
– Offset Error: ±2 mV (Maximum)
– Gain Error: ±0.75% (Maximum)
– Maximum Input Voltage: 2.048 V
– Bandwidth: 100 kHz
• Internal Reference
• SPI Frequency: Up to 20 MHz
• Temperature Range: –40°C to 105°C
• 16-Pin WSON Package
2 Applications
• Enterprise Servers
• Telecommunications
• Power Management
3 Description
The LMP92064 is a precision low-side digital current
sensor and voltage monitor with a digital SPI
interface. This analog frontend (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 2.048-V
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 lets the user 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 4.5-V to 5.5-V
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 5-mm x 4-mm
16-Pin WSON package.
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
LMP92064
WSON (16)
5.00 mm x 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Schematic
+
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
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.