MAX1303BEUP+T Maxim Integrated, MAX1303BEUP+T Datasheet - Page 13

• Manufacturer Part Number: MAX1303BEUP+T
• Description: Analog to Digital Converters - ADC 16-Bit 4Ch 115ksps 4.136V Precision ADC
• Manufacturer: Maxim Integrated

Specifications of MAX1303BEUP+T

• Rohs: yes
• Number Of Channels: 4/2
• Architecture: SAR
• Conversion Rate: 115 KSPs
• Resolution: 16 bit
• Input Type: Single-Ended/Differential
• Snr: 90 dB
• Interface Type: MICROWIRE, QSPI, SPI, Serial
• Operating Supply Voltage: 4.75 V to 5.25 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TSSOP-20
• Maximum Power Dissipation: 879 mW
• Minimum Operating Temperature: - 40 C
• Number Of Converters: 1
• Factory Pack Quantity: 2500
• Voltage Reference: Internal, External

The MAX1303 multirange, low-power, 16-bit successive-
approximation ADC operates from a single +5V supply and
has a separate digital supply allowing digital interface with
2.7V to 5.25V systems. This 16-bit ADC has internal track-
and-hold (T/H) circuitry that supports single-ended and
fully differential inputs. For single-ended conversions, the
valid analog input voltage range spans from -V
ground to +V
differential input voltage spans from -2 x V
V
grammable channel and data-acquisition configurations.
Microprocessor (µP) control is made easy through an
SPI-/QSPI-/MICROWIRE-compatible serial interface.
The MAX1303 has four single-ended analog input chan-
nels or two differential channels. Each analog input chan-
nel is independently software programmable for seven
single-ended input ranges (0V to +V
0V to +V
and three differential input ranges (±V
±2 x V
tolerant to ±6V. A fault condition on an idle channel does
not affect the conversion result of other channels.
Table 1. MAX1303 Power Supplies and Bypassing
Table 2. Analog Input Configuration Byte
REF
NUMBER
SUPPLY/GROUND
BIT
. Data can be converted in a variety of software-pro-
DVDDO/DGNDO
7
6
5
4
3
2
1
0
AVDD2/AGND2
AVDD1/AGND1
REF
DVDD/DGND
REF
POWER
). Additionally, all analog input channels are fault
, -V
REF
DIF/SGL
START
NAME
REF
C2
C1
C0
R2
R1
R0
above ground. The maximum allowable
______________________________________________________________________________________
to 0V, ±V
Detailed Description
Start Bit. The first logic 1 after CS goes low defines the beginning of the analog input configuration byte.
Channel-Select Bits. SEL[2:0] select the analog input channel to be configured (Tables 4 and 5).
Differential or Single-Ended Configuration Bit. DIF/SGL = 0 configures the selected analog input channel
for single-ended operation. DIF/SGL = 1 configures the channel for differential operation. In single-ended
mode, input voltages are measured between the selected input channel and AGND1, as shown in
Table 4. In differential mode, the input voltages are measured between two input channels, as shown in
Table 5. Be aware that changing DIF/SGL adjusts the FSR, as shown in Table 6.
Input-Range-Select Bits. R[2:0] select the input voltage range, as shown in Table 6 and Figure 6.
SUPPLY VOLTAGE
4-Channel, ±V
REF
RANGE (V)
4.75 to 5.25
4.75 to 5.25
4.75 to 5.25
/4, ±V
2.7 to 5.25
REF
REF
REF
/2, -V
/2, ±V
/2, and ±V
REF
REF
REF
REF
/2 to 0V,
to +2 x
below
TYPICAL SUPPLY
, and
CURRENT (mA)
REF
)
17.5
0.2
3.0
0.9
To maintain a low-noise environment, the MAX1303 pro-
vides separate power supplies for each section of cir-
cuitry. Table 1 shows the four separate power supplies.
Achieve optimal performance using separate AVDD1,
AVDD2, DVDD, and DVDDO supplies. Alternatively, con-
nect AVDD1, AVDD2, and DVDD together as close to the
device as possible for a convenient power connection.
Connect AGND1, AGND2, AGND3, DGND, and DGNDO
together as close as possible to the device. Bypass
each supply to the corresponding ground using a 0.1µF
capacitor (Table 1). If significant low-frequency noise is
present, add a 10µF capacitor in parallel with the 0.1µF
bypass capacitor.
The MAX1303 ADC features a fully differential, succes-
sive-approximation register (SAR) conversion tech-
nique and an on-chip T/H block to convert voltage
signals into a 16-bit digital result. Both single-ended
and differential configurations are supported with pro-
grammable unipolar and bipolar signal ranges.
REF
DESCRIPTION
Digital I/O
Analog Circuitry
Analog Circuitry
Digital Control Logic and
Memory
CIRCUIT SECTION
Multirange Inputs,
Serial 16-Bit ADC
Converter Operation
0.1µF to DGNDO
0.1µF to AGND2
0.1µF to AGND1
0.1µF to DGND
Power Supplies
BYPASSING
13