MAX5122BEEE Maxim Integrated Products, MAX5122BEEE Datasheet

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MAX5122BEEE

Manufacturer Part Number
MAX5122BEEE
Description
+5V, 12-bit, serial, force/sense DAC with 10ppm/C internal reference +2.5V. INL (LSB) +-1.
Manufacturer
Maxim Integrated Products
Datasheet

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The MAX5122/MAX5123 low-power, 12-bit, voltage-out-
put, digital-to-analog converters (DACs) feature an inter-
nal precision bandgap reference and output amplifier.
The MAX5122 operates on a single +5V supply with an
internal +2.5V reference, and offers a configurable output
amplifier. If necessary, the user can override the on-chip,
<10ppm/°C voltage reference with an external reference.
The MAX5123 has the same features as the MAX5122 but
operates from a single +3V supply and has an internal
+1.25V precision reference. The user-accessible inverting
input and output of the amplifier allows specific gain con-
figurations, remote sensing, and high output drive capa-
bility for a wide range of force/sense applications. Both
devices draw only 500µA of supply current, which
reduces to 3µA in power-down mode. In addition, their
power-up reset feature allows for a user-selectable initial
output state of either 0V or midscale and reduces output
glitches during power-up.
The serial interface is compatible with SPI™, QSPI™, and
MICROWIRE™, which makes the MAX5122/MAX5123
suitable for cascading multiple devices. Each DAC has
a double-buffered input organized as an input register
followed by a DAC register. A 16-bit shift register loads
data into the input register. The DAC register may be
updated independently or simultaneously with the input
register.
Both devices are available in a 16-pin QSOP package
and are specified for the extended-industrial (-40°C to
+85°C) operating temperature range. For pin-compatible
14-bit upgrades, see the MAX5171/MAX5173 data sheet;
for the pin-compatible 13-bit version, see the MAX5132/
MAX5133 data sheet.
19-1446; Rev 0; 3/99
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Industrial Process Control
Automatic Test Equipment
Digital Offset and Gain Adjustment
Motion Control
Microprocessor-Controlled Systems
+5V/+3V, 12-Bit, Serial, Force/Sense DACs
________________________________________________________________ Maxim Integrated Products
General Description
with 10ppm/°C Inter nal Reference
Applications
MAX5122AEEE
MAX5122BEEE
MAX5123AEEE
MAX5123BEEE
Single-Supply Operation
Built-In 10ppm/°C max Precision Bandgap Reference
SPI/QSPI/MICROWIRE-Compatible, 3-Wire Serial
Interface
Pin-Programmable Shutdown Mode and Power-
Up Reset (0 or Midscale Output Voltage)
Buffered Output Capable of Driving 5k
or 4–20mA Loads
Space-Saving 16-Pin QSOP Package
Pin-Compatible 13-Bit Upgrades Available
(MAX5132/MAX5133)
Pin-Compatible 14-Bit Upgrades Available
(MAX5171/MAX5173)
+2.5V (MAX5122)
+1.25V (MAX5123)
+5V (MAX5122)
+3V (MAX5123)
TOP VIEW
PART
RSTVAL
SCLK
OUT
PDL
CLR
DIN
CS
FB
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
1
2
3
4
5
6
7
8
Ordering Information
MAX5122
MAX5123
QSOP
Pin Configuration
PACKAGE
16 QSOP
16 QSOP
16 QSOP
16 QSOP
16
15
14
13
12
11
10
9
PIN-
V
REFADJ
REF
AGND
PD
UPO
DOUT
DGND
DD
Features
100pF
±0.5
±1
±1
±2
(LSB)
INL
1

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MAX5122BEEE Summary of contents

Page 1

... Up Reset (0 or Midscale Output Voltage) Buffered Output Capable of Driving 5k or 4–20mA Loads Space-Saving 16-Pin QSOP Package Pin-Compatible 13-Bit Upgrades Available (MAX5132/MAX5133) Pin-Compatible 14-Bit Upgrades Available (MAX5171/MAX5173) PART MAX5122AEEE MAX5122BEEE MAX5123AEEE MAX5123BEEE Applications TOP VIEW Features 100pF Ordering Information PIN- TEMP. RANGE ...

Page 2

Serial, Force/Sense DACs with 10ppm/°C Inter nal Reference ABSOLUTE MAXIMUM RATINGS V to AGND, DGND ...............................................-0.3V to +6V DD AGND to DGND.....................................................-0.3V to +0.3V Digital Inputs to DGND.............................................-0.3V to +6V Digital Outputs (DOUT, UPO) to DGND .....-0.3V to ...

Page 3

Serial, Force/Sense DACs ELECTRICAL CHARACTERISTICS—MAX5122 (+5V) (continued +5V ±10%, AGND = DGND, 33nF capacitor at REFADJ, internal reference unity-gain unless otherwise noted. Typical values are at T ...

Page 4

Serial, Force/Sense DACs with 10ppm/°C Inter nal Reference ELECTRICAL CHARACTERISTICS—MAX5123 (+3V) (continued +3V ±10%, AGND = DGND, 33nF capacitor at REFADJ, internal reference unity-gain unless otherwise noted. ...

Page 5

Serial, Force/Sense DACs TIMING CHARACTERISTICS—MAX5123 (+3V +3V ±10%, AGND = DGND, 33nF capacitor at REFADJ, internal reference unity-gain unless otherwise noted. Typical values are ...

Page 6

Serial, Force/Sense DACs with 10ppm/°C Inter nal Reference (V = +5V 100pF, output amplifier in unity-gain configuration MAX5122 INTEGRAL NONLINEARITY vs. DIGITAL INPUT CODE 0.20 0.15 0.10 0.05 ...

Page 7

Serial, Force/Sense DACs (V = +5V 100pF, output amplifier in unity-gain configuration MAX5122 DYNAMIC RESPONSE FALL TIME MAX5122/23-10 CS 5V/div OUT 1V/div 2 V/div MAX5123 INTEGRAL NONLINEARITY vs. ...

Page 8

Serial, Force/Sense DACs with 10ppm/°C Inter nal Reference (V = +5V 100pF, output amplifier in unity-gain configuration MAX5123 FULL-SCALE OUTPUT VOLTAGE vs. TEMPERATURE 1.260 1.255 1.250 1.245 1.240 ...

Page 9

Serial, Force/Sense DACs with 10ppm/°C Inter nal Reference PIN NAME 1 FB Amplifier Inverting Sense Input (Analog Input) 2 OUT Analog Output Voltage. High impedance if part is in shutdown. Reset Value Input (Digital Input). 3 RSTVAL 1: ...

Page 10

Serial, Force/Sense DACs with 10ppm/°C Inter nal Reference CS DIN SCLK PDL SR CONTROL PD RSTVAL CLR MAX5122 MAX5123 BANDGAP REFERENCE ( ) ARE FOR MAX5123 ONLY. Figure 1. Simplified Functional Diagram _______________Detailed Description The MAX5122/MAX5123 12-bit, force/sense ...

Page 11

Serial, Force/Sense DACs The circuit in Figure 3 achieves a nominal reference adjustment range of ±1%. Connect a 33nF capacitor from REFADJ to AGND to establish low-noise DAC operation. Larger capacitor values may be used, but will result ...

Page 12

Serial, Force/Sense DACs with 10ppm/°C Inter nal Reference Table 1. Serial-Interface Programming Commands 16-BIT SERIAL WORD D11 ............... XXXXXXXXXXXX 12-Bit DAC Data 12-Bit DAC Data ...

Page 13

Serial, Force/Sense DACs The 16-bit input word may be sent in two 1-byte pack- ets (SPI-, MICROWIRE-, and PIC16/PIC17-compatible), with CS low during this period. The control bits C2, C1, and C0 (table 1) determine: • The clock ...

Page 14

Serial, Force/Sense DACs with 10ppm/°C Inter nal Reference Table 3. Detailed SSPCON Register Contents MAX5122/MAX5123 CONTROL BIT WCOL BIT7 SSPOV BIT6 SSPEN BIT5 CKP BIT4 SSPM3 BIT3 SSPM2 BIT2 SSPM1 BIT1 SSPM0 BIT0 X = Don’t care Table ...

Page 15

Serial, Force/Sense DACs __________Applications Information Integral Nonlinearity (INL) Integral nonlinearity (Figure 8a) is the deviation of the values on an actual transfer function from a straight line. This straight line can be either a best-straight-line fit (closest approximation ...

Page 16

Serial, Force/Sense DACs with 10ppm/°C Inter nal Reference The settling time is the amount of time required from the start of a transition until the DAC output settles to its new output value within the converter’s specified accu- ...

Page 17

Serial, Force/Sense DACs Table 5. Unipolar Code Table (Gain = +1.6384V/V) DAC CONTENTS SUB-BIT MSB LSB S0 1111 1111 1111 0 1000 0000 0001 0 1000 0000 0000 0 0111 1111 1111 0 0000 0000 0001 0 0000 ...

Page 18

Serial, Force/Sense DACs with 10ppm/°C Inter nal Reference Using an External Reference with AC Components The MAX5122/MAX5123 have multiplying capabilities within the reference input voltage range specifications. Figure 13 shows a technique for applying a sinusoidal input to ...

Page 19

Serial, Force/Sense DACs with 10ppm/°C Inter nal Reference ______________________________________________________________________________________ Package Information 19 ...

Page 20

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1999 Maxim Integrated Products NOTES Printed USA is a registered trademark of Maxim Integrated Products ...

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