MAX1303BEUP+T Maxim Integrated, MAX1303BEUP+T Datasheet - Page 21

• 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

As shown in Figures 2 and 3, the SSTRB transitions high
to indicate that the ADC has completed a conversion
and results are ready to be read by the master. SSTRB
remains low in the external clock mode (Figure 1) and
consequently may be left unconnected. SSTRB is dri-
ven high or low regardless of the state of CS, therefore
SSTRB cannot be shared with other peripherals.
Communication with the MAX1303 is accomplished
using the three input data word formats shown in
Table 3. Each input data word begins with a start bit.
The start bit is defined as the first high bit clocked into
DIN with CS low when any of the following are true:
• Data conversion is not in process and all data from
• The device is configured for operation in external
• The device is configured for operation in external
• The device is configured for operation in internal
Output data is clocked out of DOUT in offset binary for-
mat on the falling edge of SCLK, MSB first (B15). For
output binary codes, see the Transfer Function section
and Figures 11, 12, and 13.
Each analog input has two configurable parameters:
• Single-ended or true-differential input
• Input voltage range
These parameters are configured using the analog input
configuration byte as shown in Table 2. Each analog
input has a dedicated register to store its input configura-
tion information. The timing diagram of Figure 14 shows
how to write to the analog input configuration registers.
Figure 15 shows DOUT and SSTRB timing.
An ADC’s transfer function defines the relationship
between the analog input voltage and the digital output
code. Figures 11, 12, and 13 show the MAX1303 transfer
functions. The transfer function is determined by the fol-
lowing characteristics:
• Analog input voltage range
• Single-ended or differential configuration
the previous conversion has clocked out of DOUT.
clock mode (mode 0) and previous conversion-result
bits B15–B3 have clocked out of DOUT.
acquisition mode (mode 1) and previous conversion-
result bits B15–B7 have clocked out of DOUT.
clock mode, (mode 2) and previous conversion-
result bits B15–B4 have clocked out of DOUT.
______________________________________________________________________________________
Serial Strobe Output (SSTRB)
Configuring Analog Inputs
4-Channel, ±V
Transfer Function
Output Data Format
Start Bit
• Reference voltage
The axes of an ADC transfer function are typically in least
significant bits (LSBs). For the MAX1303, an LSB is calcu-
lated using the following equation:
where N is the number of bits (N = 16) and FSR is the
full-scale range (see Figures 6 and 7).
Figure 11. Ideal Bipolar Transfer Function, Single-Ended or
Differential Input
Figure 12. Ideal Unipolar Transfer Function, Single-Ended
Input, -FSR to 0
REF
FFFD
FFFF
FFFE
8001
8000
7FFF
0003
0002
0001
0000
FFFD
FFFF
FFFE
8001
8000
7FFF
0003
0002
0001
0000
Multirange Inputs,
-32,768 -32,766
0
Serial 16-Bit ADC
1
1
LSB
2
3
INPUT VOLTAGE (LSB [DECIMAL])
INPUT VOLTAGE (LSB [DECIMAL])
=
AGND1 (DIF/SGL = 0)
2
0V (DIF/SGL = 1)
FSR
N
-1
32,768
FSR
FSR
0
×
×
+1
4 096
1 LSB =
.
1 LSB =
V
REF
65,536 x 4.096V
65,536 x 4.096V
V
FSR x V
FSR x V
+32,765 +32,767
65,533 65,535
REF
REF
(AGND1)
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