DAC8 8-Bit DAC

 

Key Features

  • Full 8-Bit Resolution and Linearity
  • Small Area: 0.133mm²
  • Size: x = 358µm; y = 372µm
  • Supply Voltage: 5V ± 10%
  • Only Single Power Supply Required 

Symbol

 

Description

This Macro Cell is an 8-Bit digital to analog converter. The architecture is based on two resistor dividers.

Because of its high output impedance, which is also code-dependent, it must be used together with a low offset operational amplifier at the output (e.g. OP03B). VRN and VRP must be within the common mode range of the opamp (e.g. between 1.5V and 3.5V).

Pin List

Pin Description Capacitance
RP Positive Reference Voltage
RN Negative Reference Voltage
DACOUT Analog output
b<7:0> Data Input b(0) .. LSB
 

Power Supplies

The converter requires one power supply (vdda, gnd).

Electrical Parameters

Vsupply: 5V ± 10%
Temperature: 0°C ... 25°C ... 85°C
The maximum error between the ideal and the real transfer curve never exceeds 1 LSB.

Parameter Symbol Min Typ Max Unit
Resolution    8      Bit
Input Voltage Range  Vin  VSS    VDD  V
Differential Nonlinearity  DNL    ± 0.25   LSB *
Integral Nonlinearity  INL   ± 0.25   LSB *
Offset Voltage  Vos    ± 0.25   LSB *
Reference Impedance  Rref 6.7 8 10.4  kOhms
Power Supply Range  Vdd 4.5 5 5.5  V
Power Supply Current  Idd   0.13 **   mA
Power Consumption  PVdd   0.13 **   mW
Output Resistance  Rout   21 ***   kOhms
  Transient Parameters (5V, 25°C)         
Settling time ts (Cload = 30pF) < 1     µs
 

* Conditions :VRP = 3.5V; VRN = 1.5V, VDD = 5V, temp = 25°C
** Vrefp-Vrefn = 1V
*** Middle of the resistor string; Code: 0111 0111 (output resistance is code-dependent)
Idd includes the current through the resistor string.

Vout = (VRP-VRN) / 256 * code_in + VRN


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