MC3410 Datasheet, PDF (6/8 Pages) NXP Semiconductors – 10-Bit high-speed multiplying D/A converter

Philips Semiconductors Linear Products
10-Bit high-speed multiplying D/A converter
Product specification
MC3410,
MC3410C
V_R (+)
D₁ THROUGH D₁₀
R_T
V_CC
14
R₁₆
16
3410
R₁₅
15
I_O
3
1
2
V_EE
NOTES:
R₁₆ + R_T = R₁₅ = R_REF
R_T < <R₁₆
I_O F.S. = 2 I_R = V_REF/R_REF
a. Positive Reference Voltage
D₁ THROUGH D₁₀
R_T
V_CC
R₁₆
13
3410
V_R (–)
R₁₅
15
I_O
1
2
V_EE
a. Negative Reference Voltage
NOTES:
R₁₅ + R_T = R₁₆
R_T < <R₁₅
IV_REF ≥ R_VEE + 3V
Figure 6. Basic Connections
MONOTONICITY
The MC3410 and MC3410C are guaranteed monotonic over
temperature. This means that for every increase in the input digital
code, the output current either remains the same or increases but
never decreases. In the multiplying mode, where reference input
current will vary, monotonicity can be assured if the reference input
current remains above 0.5mA.
SETTLING TIME
The worst-case switching condition occurs when all bits are
switched “on,” which corresponds to a low-to-high transition for all
bits. This time is typically 250ns for the output to settle to within
±1/2LSB for 10-bit accuracy, and 200ns for 8-bit accuracy. The
turn-off time is typically 120ns. These times apply when the output
swing is limited to a small (<0.7V) swing and the external output
capacitance is under 25pF.
The major carry (MSB off-to-on, all others on-to-off) settles in
approximately the same time as when all bits are switched off-to-on.
If a load resistor of 625Ω is connected to ground, allowing the output
to swing to -2.5V, the settling time increases to 1.5µs.
Extra care must be taken in board layout as this is usually the
dominant factor in satisfactory test results when measuring settling
time. Short leads, 100µF supply bypassing, and minimum scope
lead length are all necessary.
A typical test setup for measuring settling time is shown in Figure 7.
The same setup for the most part can be used to measure the slew
rate of the reference amplifier (Figure 9) by tying all data bits high,
pulsing the voltage reference input between 0 and 2V, and using a
500Ω load resistor R_L.
August 31, 1994
748