MAX1111EEE+T Maxim Integrated Products, MAX1111EEE+T Datasheet - Page 11

• Manufacturer Part Number: MAX1111EEE+T
• Description: IC ADC 8BIT LP 16-QSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX1111EEE+T

• Number Of Bits: 8
• Sampling Rate (per Second): 50k
• Data Interface: MICROWIRE™, QSPI™, Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 667mW
• Voltage Supply Source: Single Supply
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-SSOP (0.150", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

in control bytes of $FF (hex), which trigger single-
ended, unipolar conversions on CH7 (MAX1110) or
CH3 (MAX1111) in external clock mode without power-
ing down between conversions. In external clock mode,
the SSTRB output pulses high for two clock periods
before the most significant bit of the 8-bit conversion
result is shifted out of DOUT. Varying the analog input
alters the output code. A total of 10 clock cycles is
required per conversion. All transitions of the SSTRB
and DOUT outputs occur on SCLK’s falling edge.
A conversion is started by clocking a control byte into
DIN. With CS low, each rising edge on SCLK clocks a bit
from DIN into the MAX1110/MAX1111’s internal shift reg-
Table 4. Full-Scale and Zero-Scale Voltages
Figure 5. Quick-Look Circuit
*FULL-SCALE ANALOG INPUT, CONVERSION RESULT = $FF (HEX)
( ) ARE FOR THE MAX1111.
V
REFIN
ANALOG
Full Scale
+2.048V
INPUT
0V TO
+ COM
0.01µF
UNIPOLAR MODE
C1
1µF
______________________________________________________________________________________
How to Start a Conversion
REFIN
CH7 (CH3)
COM
REFOUT
MAX1110
MAX1111
Zero Scale
COM
+2.7V, Low-Power, Multichannel,
SSTRB
DGND
AGND
SHDN
DOUT
SCLK
V
DIN
CS
DD
0.1µF
N.C.
+V
+3V
Full Scale
Positive
+ COM
REFIN
ister. After CS falls, the first arriving logic “1” bit at DIN
defines the MSB of the control byte. Until this first start bit
arrives, any number of logic “0” bits can be clocked into
DIN with no effect. Table 3 shows the control-byte format.
The MAX1110/MAX1111 are compatible with MICROWIRE,
SPI, and QSPI devices. For SPI, select the correct clock
polarity and sampling edge in the SPI control registers:
set CPOL = 0 and CPHA = 0. MICROWIRE, SPI, and
QSPI all transmit a byte and receive a byte at the same
time. Using the Typical Operating Circuit (Figure 3), the
simplest software interface requires three 8-bit transfers
to perform a conversion (one 8-bit transfer to configure
the ADC, and two more 8-bit transfers to clock out the
8-bit conversion result). Figure 6 shows the MAX1110/
MAX1111 common serial-interface connections.
/ 2
1µF
OSCILLATOR
500kHz
+3V
BIPOLAR MODE
Serial 8-Bit ADCs
Scale
COM
Zero
CH1
OSCILLOSCOPE
CH2
CH3
-V
Full Scale
Negative
CH4
+ COM
REFIN
/ 2
SCLK
SSTRB
DOUT*
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