MAX11044_11 Datasheet, PDF (15/27 Pages) Maxim Integrated Products – 4-/6-/8-Channel, 16-/14-Bit, Simultaneous-Sampling ADCs

4-/6-/8-Channel, 16-/14-Bit,
Simultaneous-Sampling ADCs
MAX11054
(TQFP-EP)
PIN
MAX11055
(TQFP-EP)
MAX11056
(TQFP-EP)
27, 33, 40, 48,
54
27, 33, 40, 48,
54
27, 33, 40, 48,
54
37
34
31
39
37
34
42
39
37
44
42
39
41
41
41
—
44
42
—
47
44
—
—
47
—
—
50
61
61
61
62
62
62
63
63
63
64
64
64
31, 34, 47, 50
31, 50
—
—
—
—
NAME
RDC
CH0
CH1
CH2
CH3
REFIO
CH4
CH5
CH6
CH7
WR
CS
RD
DB13
I.C.
EP
Pin Description (continued)
FUNCTION
Reference Buffer Decoupling. Connect all RDC outputs
together. Bypass to AGND with at least an 80µF total
capacitance. See the Layout, Grounding, and Bypassing
section.
Channel 0 Analog Input
Channel 1 Analog Input
Channel 2 Analog Input
Channel 3 Analog Input
External Reference Input/Internal Reference Output.
Place a 0.1µF capacitor from REFIO to AGND.
Channel 4 Analog Input
Channel 5 Analog Input
Channel 6 Analog Input
Channel 7 Analog Input
Active-Low Write Input. Drive WR low to write to the
ADC. Configuration registers are loaded on the rising
edge of WR.
Active-Low Chip-Select Input. Drive CS low when
reading from or writing to the ADC.
Active-Low Read Input. Drive RD low to read from the
ADC. Each rising edge of RD advances the channel
output on the data bus.
14-Bit Parallel Data Bus Digital Output Bit 14
Internally Connected. Connect to AGND.
Exposed Pad. Internally connected to AGND. Connect to
a large ground plane to maximize thermal performance.
Not intended as an electrical connection point.
Detailed Description
The MAX11044/MAX11045/MAX11046 and MAX11054/
MAX11055/MAX11056 are fast, low-power ADCs that
combine 4, 6, or 8 independent ADC channels in a sin-
gle IC. Each channel includes simultaneously sampling
independent T/H circuitry that preserves relative phase
information between inputs making the MAX11044/
MAX11045/MAX11046 and MAX11054/MAX11055/
MAX11056 ideal for motor control and power monitor-
ing. The MAX11044/MAX11045/MAX11046 and
MAX11054/MAX11055/MAX11056 are available with
±5V input ranges that feature ±20mA overrange, fault-
tolerant inputs. The MAX11044/MAX11045/MAX11046
and MAX11054/MAX11055/MAX11056 operate with a
single 4.75V to 5.25V supply. A separate 2.7V to 5.25V
supply for digital circuitry makes the devices compatible
with low-voltage processors.
The MAX11044/MAX11045/MAX11046 and MAX11054/
MAX11055/MAX11056 perform conversions for all chan-
nels in parallel by activating independent ADCs. Results
are available through a high-speed, 20MHz, parallel
data bus after a conversion time of 3µs following the end
of a sample. The data bus is bidirectional and allows for
easy programming of the configuration register. The
MAX11044/MAX11045/MAX11046 and MAX11054/
MAX11055/MAX11056 feature a reference buffer, which
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