Rainbow Electronics MAX5661 - Manual (Page 26)

MAX5661
Single 16-Bit DAC with Current and Voltage
Outputs for Industrial Analog Output Modules
26 _______________________________________________________________________________________
N9 N8 N7 N6 N5 N4 N3 N2 N1 N0
D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Table 9. N to D: Full-Scale Output Trim Register Bits Map
DECIMAL
VALUE (N)
BIT DECIMAL
VALUE (B)
% CHANGE
0 511 -25
256 255 -12.5
511 0 0 -
512 1023 0 +
767 768 +12.5
1023 512 +25
Table 10. Full-Scale Output Variation vs.
N and B
BITS (B) TO NUMERICAL (N)
TRANSFER FUNCTION
MAX5661 fig06
BITS (B)
NU
M
BER (N)
% CHANGE FULL-SCALE OUTPUT
1000 900 700 800 200 300 400 500 600 100
100
200
300
400
500
600
700
800
900
1000
+25%
+12.5%
0%
-12.5%
-25%
1100
0
0 1100
Figure 6. Transfer Function of Bits (B) to Numerical (N)
Representation
Full-Scale Output
Current Trim Register (Write)
Write to the full-scale output trim register to adjust the
output voltage or current ±25%. Set command bits to
0x06 to write to the output trim register. Bit 15 enables
the output trim register. Bits D9–D0 program the 10-bit
trim DAC (Table 8).