Rainbow Electronics MAX5858 - Manual (Page 12)

MAX5858
Dual, 10-Bit, 300Msps, Current-Output DAC with
4x/2x/1x Interpolation Filters
12 ______________________________________________________________________________________
Pin Description (continued)
PIN NAME FUNCTION
10 DA2/G0 Channel A Input Data Bit 2/Channel A Gain Adjustment Bit 0
11 DA1 Channel A Input Data Bit 1
12 DA0 Channel A Input Data Bit 0 (LSB)
13 DB9 Channel B Input Data Bit 9 (MSB)
14 DB8 Channel B Input Data Bit 8
15 DB7 Channel B Input Data Bit 7
16 DB6 Channel B Input Data Bit 6
17 DB5 Channel B Input Data Bit 5
20 CLK Clock Output
21 IDE
Interleave Data Mode Enable. When IDE is high, data for both DAC channels is written through port A
(bits DA9–DA0). When IDE is low, channel A data is latched on the rising edge of CLK and channel B
is latched on the falling edge of CLK.
22 DB4 Channel B Input Data Bit 4
23 DB3 Channel B Input Data Bit 3
24 DB2 Channel B Input Data Bit 2
25 DB1 Channel B Input Data Bit 1
26 DB0 Channel B Input Data Bit 0 (LSB)
27 CW Active-Low Control Word Write Pulse. The control word is latched on the falling edge of CW.
28, 34 I.C. Internally Connected. Do not connect.
29, 33 CGND Clock Ground
30 CLKXP
Differential Clock Input Positive Terminal. Bypass CLKXP with a 0.01µF capacitor to CGND when
CLKXN is in single-ended mode.
31 CLKXN
Differential Clock Input Negative Terminal. Bypass CLKXN with a 0.01µF capacitor to CGND when
CLKXP is in single-ended mode.
32 CV
DD
Clock Power Supply. See the Power Supplies, Bypassing, Decoupling, and Layout section.
35 REN Active-Low Reference Enable. Connect REN to AGND to activate the on-chip 1.24V reference.
36 REFO
Reference I/O. REFO serves as the reference input when the internal reference is disabled. If the
internal 1.24V reference is enabled, REFO serves as the output for the internal reference. When the
internal reference is enabled, bypass REFO to AGND with a 0.1µF capacitor.
37, 38 N.C. No Connection. Not internally connected.
39 REFR
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
× V
REFO /R SET .
40, 46 AV DD Analog Power Supply. See Power Supplies, Bypassing, Decoupling, and Layout section.
41 OUTNB Channel B Negative Analog Current Output
42 OUTPB Channel B Positive Analog Current Output
43 AGND Analog Ground
44 OUTNA Channel A Negative Analog Current Output
45 OUTPA Channel A Positive Analog Current Output
— EP Exposed Pad. Connect to the ground plane.