MAX1112CAP+ Maxim Integrated Products, MAX1112CAP+ Datasheet - Page 12

• Manufacturer Part Number: MAX1112CAP+
• Description: IC ADC 8-BIT 50KSPS 20-SSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX1112CAP+

• Number Of Bits: 8
• Sampling Rate (per Second): 50k
• Data Interface: MICROWIRE™, QSPI™, Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 680µW
• Voltage Supply Source: Single Supply
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 20-SSOP
• Number Of Adc Inputs: 8
• Architecture: SAR
• Conversion Rate: 50 KSPs
• Resolution: 8 bit
• Input Type: Differential
• Interface Type: 4-Wire (SPI, QSPI, MICROWIRE)
• Voltage Reference: Internal 4.096 V or External
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Maximum Power Dissipation: 640 mW
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

+5V, Low-Power, Multi-Channel,
Serial 8-Bit ADCs
Figure 6. Common Serial-Interface Connections to the
MAX1112/MAX1113
Figure 7. Single-Conversion Timing, External Clock Mode, 24 Clocks
12
SSTRB
DOUT
A/D STATE
SCLK
DIN
CS
______________________________________________________________________________________
a) SPI
b) QSPI
c) MICROWIRE
START
1
MISO
MISO
SCK
SCK
SEL2 SEL1 SEL0 UNI/
I/O
CS
I/O
SS
SS
SK
SI
IDLE
RB1
+5V
+5V
4
BIP
SGL/
DIF
(f
SCLK
ACQUISITION
PD1
t
CS
SCLK
DOUT
CS
SCLK
DOUT
CS
SCLK
DOUT
4 s
ACQ
= 500kHz)
PD0
MAX1112
MAX1113
MAX1112
MAX1113
MAX1112
MAX1113
8
B7
B6
12
RB2
B5
8-bit conversion result). Figure 6 shows the MAX1112/
MAX1113 common serial-interface connections.
Make sure the CPU’s serial interface runs in master
mode so the CPU generates the serial clock. Choose a
clock frequency from 50kHz to 500kHz.
1) Set up the control byte for external clock mode and
2) Use a general-purpose I/O line on the CPU to pull
3) Transmit TB1 and, simultaneously, receive a byte
4) Transmit a byte of all zeros ($00 hex) and, simulta-
5) Transmit a byte of all zeros ($00 hex) and, simulta-
6) Pull CS high.
Figure 7 shows the timing for this sequence. Bytes RB2
and RB3 contain the result of the conversion padded
with two leading zeros and six trailing zeros. The total
conversion time is a function of the serial-clock
frequency and the amount of idle time between 8-bit
transfers. Make sure that the total conversion time does
not exceed 1ms, to avoid excessive T/H droop.
CONVERSION
call it TB1. TB1 should be of the format 1XXXXX11
binary, where the Xs denote the particular channel
and conversion mode selected.
CS low.
and call it RB1. Ignore RB1.
neously, receive byte RB2.
neously, receive byte RB3.
B4
B3
B2
16
B1
B0
FILLED WITH ZEROS
Simple Software Interface
20
RB3
IDLE
24