MAX1086ETA+T Maxim Integrated Products, MAX1086ETA+T Datasheet - Page 10

• Manufacturer Part Number: MAX1086ETA+T
• Description: IC ADC 10BIT 150KSPS 8-TDFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX1086ETA+T

• Number Of Bits: 10
• Sampling Rate (per Second): 150k
• Data Interface: MICROWIRE™, QSPI™, Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 1.6mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-WDFN Exposed Pad
• Number Of Adc Inputs: 2
• Architecture: SAR
• Conversion Rate: 150 KSPs
• Resolution: 10 bit
• Input Type: Differential
• Interface Type: 3-Wire (SPI, QSPI, MICROWIRE)
• Voltage Reference: External
• Supply Voltage (max): 5 V
• Maximum Power Dissipation: 1454.5 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MAX1086ETA+T

150ksps, 10-Bit, 2-Channel Single-Ended, and
1-Channel True-Differential ADCs in SOT23 and TDFN
Figures 5a and 5b illustrate the conversion timing for
the MAX1086–MAX1089. The 10-bit conversion result is
output in MSB first format, followed by two sub-bits (S1
and S0). Data on DOUT transitions on the falling edge
of SCLK. All 12-bits must be clocked out before CNVST
transitions again. For the MAX1088/MAX1089, data is
straight binary for unipolar mode and two’s comple-
ment for bipolar mode. For the MAX1086/MAX1087,
data is always straight binary.
With CNVST low, the MAX1086–MAX1089 defaults to an
AutoShutdown state (<0.2µA) after power-up and
between conversions. After detecting a rising edge on
CNVST, the part powers up, sets DOUT low and enters
track mode. After detecting a falling-edge on CNVST, the
device enters hold mode and begins the conversion. A
maximum of 3.7µs later, the device completes conver-
sion, enters shutdown and MSB is available at DOUT.
An external reference is required for the MAX1086–
MAX1089. Use a 0.1µF bypass capacitor for best per-
formance. The reference input structure allows a volt-
age range of +1V to V
Figure 6. Unipolar Transfer Function
10
11 . . . 111
11 . . . 110
00 . . . 011
00 . . . 010
11 . . . 101
00 . . . 001
00 . . . 000
______________________________________________________________________________________
OUTPUT CODE
0
1
Applications Information
2
INPUT VOLTAGE (LSB)
3
Automatic Shutdown Mode
DD
+ 50mV.
FULL-SCALE
TRANSITION
Output Data Format
External Reference
FS - 3/2LSB
MAX1086–
MAX1089
1LSB =
FS = V
ZS = GND
FS
REF
1024
V
REF
Figure 6 shows the unipolar transfer function for the
MAX1086–MAX1089. Figure 7 shows the bipolar transfer
function for the MAX1088/MAX1089. Code transitions
occur halfway between successive-integer LSB values.
The MAX1086–MAX1089 feature a serial interface that is
fully compatible with SPI, QSPI, and MICROWIRE. If a
serial interface is available, establish the CPU’s serial
interface as a master, so that the CPU generates the seri-
al clock for the ADCs. Select a clock frequency up to
8MHz.
1)
2)
3)
4)
5)
Figure 7. Bipolar Transfer Function
*V
COM
011 . . . 111
011 . . . 110
000 . . . 010
000 . . . 001
000 . . . 000
111 . . . 111
111 . . . 110
111 . . . 101
100 . . . 001
100 . . . 000
Use a general purpose I/O line on the CPU to hold
CNVST low between conversions.
Drive CNVST high to acquire AIN1(MAX1086/
MAX1087) or unipolar mode (MAX1088/MAX1089).
To acquire AIN2(MAX1086/MAX1087) or bipolar
mode (MAX1088/MAX1089), drive CNVST low and
high again.
Hold CNVST high for 1.4µs.
Drive CNVST low and wait approximately 3.7µs for
conversion to complete. After 3.7µs, the MSB is
available at DOUT.
Activate SCLK for a minimum of 12 rising clock
edges. DOUT transitions on SCLK’s falling edge
≤
OUTPUT CODE
V
REF
/ 2 *V
Connection to Standard Interfaces
-FS =
1LSB =
- FS
FS =
ZS = 0
IN
= (AIN+) - (AIN-)
-V
V
How to Perform a Conversion
REF
2
2
1024
REF
V
REF
INPUT VOLTAGE (LSB)
Transfer Function
0
MAX1088/MAX1089
+FS - 1LSB