MAX5876 Maxim Integrated Products, MAX5876 Datasheet - Page 11

• Manufacturer Part Number: MAX5876
• Description: Dual DAC with LVDS Inputs
• Manufacturer: Maxim Integrated Products

The MAX5876 high-performance, 12-bit, dual current-
steering DAC (Figure 1) operates with DAC update rates
up to 250Msps. The converter consists of input registers
and a demultiplexer for single-port operation, followed by
a current-steering array. During operation, the input data
registers demultiplex the single-port data bus. The cur-
rent-steering array generates differential full-scale cur-
rents in the 2mA to 20mA range. An internal
current-switching network, in combination with external
50Ω termination resistors, converts the differential output
currents into dual differential output voltages with a 0.1V
to 1V peak-to-peak output voltage range. An integrated
Figure 1. MAX5876 High-Performance, 12-Bit, Dual Current-Steering DAC
DATA11–
12-Bit, 250Msps, High-Dynamic-Performance,
DATA0
SELIQP
SELIQN
AV
XORN
XORP
CLKN
TORB
CLKP
CLK
______________________________________________________________________________________
RECEIVER
Detailed Description
DV
LVDS
DD3.3
LATCH
POWER-DOWN
Architecture
INTERFACE
BLOCK
CLK
PD
DV
DD1.8
Dual DAC with LVDS Inputs
LATCH
LATCH
AV
DD1.8
MAX5876
+1.2V bandgap reference, control amplifier, and user-
selectable external resistor determine the data convert-
er’s full-scale output range.
The MAX5876 supports operation with the internal
+1.2V bandgap reference or an external reference volt-
age source. REFIO serves as the input for an external,
low-impedance reference source. REFIO also serves as
a reference output when the DAC operates in internal
reference mode. For stable operation with the internal
reference, decouple REFIO to GND with a 1µF capaci-
tor. Due to its limited output drive capability, buffer
REFIO with an external amplifier when driving large
external loads.
DECODE
DECODE
XOR/
XOR/
Reference Architecture and Operation
LATCH
LATCH
AV
GND
DD3.3
LATCH
LATCH
REFERENCE
+1.2V
DAC
DAC
DACREF
OUTQN
OUTQP
OUTIN
FSADJ
OUTIP
REFIO
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