MC3410 Datasheet, PDF (4/8 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
4.0
3.0
V_CC = +5.0V
V_EE = -15.0V
2.0
T_A = 25^oC
I_REF = 2mA
1.0
0
–1.0
–5 –3
–1 0 1
3
5
COMPLIANCE VOLTAGE (VOLTS)
Figure 1. Output Current vs Output Compliance Voltage
4.0
3.0
2.0
1.0
+V_CC = +5V
–V_EE = –15V
0
I_REF = 2mA
–1.0
–2.0
–3.0
–4.0
–75 –50 –25
0 25 50 75
T_A = (^oC)
100 125
Figure 2. Maximum Output Compliance
Voltage vs Temperature
13
12
I_EE
11
10
+V_CC = +5V
–V_EE = –15V
4
I_REF = 2mA
3
2
+I_CC
1
0
–75 –50 –25
0 25 50
TA (^oC)
75 100 125
Figure 3. Power Supply Current vs Temperature
18.0
16.0 B CURVE
R15 = R16 = 1.0k
14.0
12.0
10.0
8.0
6.0
SMALL SIGNAL BW ^{VREF (–) = 0V}
r_o = 100Ω
V_REF (+) = 50 mV p–p
CENTERED AT + 200mV
4.0
2.0
0
–2.0 ^{A CURVE}
–4.0 _{LARGE SIGNAL BW}
–6.0 r_o = 200Ω
–8.0
–10
V_REF (+) = 2 Vp–p
CENTERED AT + 1.0V
–12
0.1 0.2 0.3 0.5 1.0 2.0 3.0 5.0 10
I, FREQUENCY (MHz)
Figure 4. Reference Amplifier Frequency Response
CIRCUIT DESCRIPTION
The MC3410 consists of four segment current sources which
generate the two most significant bits (MSBs), and an R-2R DAC
implemented with ion-implanted resistors for scaling the remaining
eight least significant bits (LSBs) (See Figure 5). This approach
provides complete 10-bit accuracy without trimming.
The individual bit currents are switched ON or OFF by fully
differential current switches. The switches use current steering for
speed.
An on-chip high-slew reference current amplifier drives the R-2R
ladder and segment decoder. The currents are scaled in such a way
that, with all bits on, the maximum output current is two times
1023/1024 of the reference amplifier current, or nominally 3.996mA
for a 2.000mA reference input current. The reference amplifier
allows the user to provide a voltage input. Out-board resistor R₁₆
(see Figure 6) converts this voltage to a usable current. A current
mirror doubles this reference current and feeds it to the segment
decoder and resistor ladder. Thus, for a reference voltage of 2.0V
and a 1kΩ resistor tied to Pin 16, the full-scale current is
approximately 4.0mA. This relationship will remain regardless of the
reference voltage polarity.
Connections for a positive reference voltage are shown in Figure 6a.
For negative reference voltage inputs, or for bipolar reference
voltage inputs in the multiplying mode, R₁₅ can be tied to a negative
voltage corresponding to the minimum input level. For a negative
reference input, R₁₆ should be grounded (Figure 6b). In addition, the
negative voltage reference must be at least 3V above the V_EE
supply voltage for best operation. Bipolar input signals may be
handled by connecting R₁₆ to a positive voltage equal to the peak
positive input level at Pin 15.
August 31, 1994
746