MAX1273EUA+ Maxim Integrated, MAX1273EUA+ Datasheet - Page 9

• Manufacturer Part Number: MAX1273EUA+
• Description: Analog to Digital Converters - ADC FAULT-PROTECTED 12-BIT ADC
• Manufacturer: Maxim Integrated

Specifications of MAX1273EUA+

• Rohs: yes
• Number Of Channels: 1
• Architecture: SAR
• Conversion Rate: 87 KSPs
• Resolution: 12 bit
• Input Type: Single-Ended
• Snr: Yes
• Interface Type: QSPI, Serial (SPI, Microwire)
• Operating Supply Voltage: 4.75 V to 5.25 V
• Maximum Operating Temperature: + 85 C
• Package / Case: uMAX
• Maximum Power Dissipation: 727 mW
• Minimum Operating Temperature: - 40 C
• Number Of Converters: 1
• Voltage Reference: Internal, External

The MAX1272/MAX1273 provide software-selectable
analog input voltage ranges. Program the analog input
to one of four ranges by setting the appropriate control
bits (RNG, BIP) in the control byte (Table 1). The
MAX1272 has selectable input voltage ranges extend-
ing to ±10V (±V
selectable input voltage ranges extending to ±V
Figure 3 shows the equivalent input circuit.
Figure 2. Simplified Block Diagram
Table 1. Control-Byte Format
7 (MSB)
0 (LSB)
START
(MSB)
BIT 7
BIT
6
5
4
3
2
1
RESERVED
REF
MODE1
MODE0
START
GND
NAME
_______________________________________________________________________________________
REF
BIT 6
V
AIN
RNG
RNG
REF
DD
BIP
PD
Input Range and Protection

2.4414), while the MAX1273 has
with Software-Selectable Input Range
CONDITIONING
Write a logic 1 (see the Input Data Format section)
Selects the full-scale input voltage range (Tables 2, 3)
Selects unipolar or bipolar conversion mode (Tables 2, 3)
Selects normal operation (PD = 1) or power-down (PD = 0) mode
Selects standby power-down (STBYPD) or full power-down (FULLPD) mode (Table 4)
Selects delayed or immediate power-down mode (Table 4)
Write a logic 0
Selects external (REF = 0, default) or internal (REF = 1) reference mode
REFERENCE
SIGNAL
4.096V
BIT 5
BIP
MAX1272
MAX1273
BIT 4
Fault-Protected, 12-Bit ADCs
PD
T/H
REF
.
IN
MODE1
Bit 3
Overvoltage circuitry at the analog input provides ±12V
fault protection for the MAX1272. This circuit limits the
current going into or out of the device to less than 2mA,
providing an added layer of protection from momentary
over/undervoltages at the analog input. The overvoltage
protection activates when the device enters power-
down mode or if V
DIN
SERIAL INTERFACE
SAR ADC
12-BIT
LOGIC
DOUT
OUT
REF
DESCRIPTION
CS
MODE0
CLK
BIT 2
DD
= 0V.
RESERVED
SCLK
BIT 1
(LSB)
BIT 0
REF
9