max5853 Maxim Integrated Products, Inc., max5853 Datasheet - Page 11

• Manufacturer Part Number: max5853
• Description: Max5853 Dual, 10-bit, 80msps, Current-output Dac
• Manufacturer: Maxim Integrated Products, Inc.

Figure 2. Simplified Diagram
DA8/DACEN
33, 39
36, 40
DA6/REN
PIN
DA7/IDE
DA9/PD
DA2/G0
DA3/G1
DA4/G2
DA5/G3
32
34
35
37
38
—
CLKXN
CLKXP
DGND
CGND
DV
CV
DCE
DA0
DA1
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
DB8
DB9
CLK
CW
DD
DD
OUTNB
OUTNA
OUTPB
OUTPA
NAME
AGND
Dual, 10-Bit, 80Msps, Current-Output DAC
REFR
AV
MANAGEMENT
MANAGEMENT
DISTRIBUTION
INTERLEAVER
EP
INPUT DATA
DD
______________________________________________________________________________________
DIGITAL
POWER
POWER
CLOCK
CLOCK
Full-Scale Current Adjustment. To set the output full-scale current, connect an external resistor RSET
between REFR and AGND. The output full-scale current is equal to 32 x V
CONTROLLER
MAX5853
Anal og P ow er Inp ut. S ee the P ow er S up p l i es, Byp assi ng , D ecoup l i ng , and Layout secti on for m or e d etai l s.
Channel B Negative Analog Current Output
Channel B Positive Analog Current Output
Analog Ground
Channel A Negative Analog Current Output
Channel A Positive Analog Current Output
Exposed Paddle. Connect EP to the common point of all ground planes.
CHANNEL A
OPERATING
CONTROL
10-BIT
10-BIT
DACA
DACB
MODE
GAIN
1.24V REFERENCE
AND CONTROL
AMPLIFIER
IDE
REN
MANAGEMENT
ANALOG
POWER
G0
G1
G2
G3
DACEN
PD
OUTPA
OUTNA
OUTPB
OUTNB
REFO
REFR
AGND
AV
AGND
DD
R
SET
The MAX5853 dual, high-speed, 10-bit, current-output
DAC provides superior performance in communication
systems requiring low-distortion analog-signal recon-
struction. The MAX5853 combines two DACs and an on-
chip 1.24V reference (Figure 2). The current outputs of
the DACs can be configured for differential or single-
ended operation. The full-scale output current range is
adjustable from 2mA to 20mA to optimize power dissi-
pation and gain control.
The MAX5853 accepts an input data and a DAC con-
version rate of 80MHz. The inputs are latched on the
rising edge of the clock whereas the output latches on
the following rising edge.
The MAX5853 features three modes of operation: normal,
standby, and power-down (Table 2). These modes allow
efficient power management. In power-down, the
MAX5853 consumes only 1µA of supply current. Wake-
up time from standby mode to normal DAC operation
is 3µs.
An 8-bit control word routed through channel A’s data
port programs the gain matching, reference, and the
operational mode of the MAX5853. The control word is
latched on the rising edge of CW. CW is independent
of the DAC clock. The DAC clock can always remain
running when the control word is written to the DAC.
Table 1 and Table 2 represent the control word format
and function.
The gain on channel A can be adjusted to achieve gain
matching between two channels in a user’s system.
The gain on channel A can be adjusted from -0.4dB to
0.35dB in steps of 0.05dB by using bits G3 to G0 (see
Table 3).
FUNCTION
Pin Description (continued)
Detailed Description
Programming the DAC
REFO
/R
SET
.
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