max5886 Maxim Integrated Products, Inc., max5886 Datasheet - Page 8

• Manufacturer Part Number: max5886
• Description: Max5886 3.3v, 12-bit, 500msps High Dynamic Performance Dac With Differential Lvds Inputs
• Manufacturer: Maxim Integrated Products, Inc.

The MAX5886 is a high-performance, 12-bit, current-
steering DAC (Figure 1) capable of operating with clock
speeds up to 500MHz. The converter consists of sepa-
rate input and DAC registers, followed by a current-
steering circuit. This circuit is capable of generating
differential full-scale currents in the range of 2mA to
20mA. An internal current-switching network in combi-
nation with external 50Ω termination resistors convert
the differential output currents into a differential output
voltage with a peak-to-peak output voltage range of
0.1V to 1V. An integrated 1.2V bandgap reference, con-
trol amplifier, and user-selectable external resistor
determine the data converter’s full-scale output range.
The MAX5886 supports operation with the on-chip 1.2V
bandgap reference or an external reference voltage
source. REFIO serves as the input for an external, low-
impedance reference source, and as the output if the
DAC is operating with the internal reference. For stable
operation with the internal reference, REFIO should be
decoupled to AGND with a 0.1µF capacitor. Due to its
3.3V, 12-Bit, 500Msps High Dynamic
Performance DAC with Differential LVDS Inputs
8
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PIN
47
48
49
50
51
52
53
54
55
56
57
58
59
63
64
65
66
67
68
Reference Architecture and Operation
NAME
B9N
B8N
B7N
B6N
B5N
B4N
B3N
B2N
B1N
B0N
B8P
B7P
B6P
B5P
B4P
B3P
B2P
B1P
B0P
Detailed Description
Complementary Data Bit 9
Data Bit 8
Complementary Data Bit 8
Data Bit 7
Complementary Data Bit 7
Data Bit 6
Complementary Data Bit 6
Data Bit 5
Complementary Data Bit 5
Data Bit 4
Complementary Data Bit 4
Data Bit 3
Complementary Data Bit 3
Data Bit 2
Complementary Data Bit 2
Data Bit 1
Complementary Data Bit 1
Data Bit 0
Complementary Data Bit 0
Architecture
limited output drive capability REFIO must be buffered
with an external amplifier, if heavier loading is required.
The MAX5886’s reference circuit (Figure 2) employs a
control amplifier, designed to regulate the full-scale
current I
DAC. Configured as a voltage-to-current amplifier, the
output current can be calculated as follows:
where I
V
the DAC. Located between FSADJ and DACREF, R
is the reference resistor, which determines the amplifi-
er’s output current for the DAC. See Table 1 for a matrix
of different I
The MAX5886 outputs two complementary currents
(IOUTP, IOUTN) that can be operated in a single-ended
or differential configuration. A load resistor can convert
these two output currents into complementary single-
REFIO
FUNCTION
/R
REFIO
OUT
SET
Pin Description (continued)
OUT
I
) and I
OUT
for the differential current outputs of the
is the reference output current (I
I
Analog Outputs (IOUTP, IOUTN)
OUT
and R
= 32
OUT
= 32
✕
SET
is the full-scale output current of
I
REFIO
✕
selections.
I
REFIO
- (I
- 1 LSB
OUT
/ 2
12
)
REFIO
SET
=