AD7811YN Analog Devices Inc, AD7811YN Datasheet
AD7811YN
Specifications of AD7811YN
Available stocks
Related parts for AD7811YN
AD7811YN Summary of contents
Page 1
GENERAL DESCRIPTION The AD7811 and AD7812 are high speed, low power, 10-bit A/D converters that operate from a single 2 5.5 V supply. The devices contain a 2.3 µs successive approximation A/D converter, an on-chip track/hold amplifier, ...
Page 2
AD7811/AD7812–SPECIFICATIONS Parameter DYNAMIC PERFORMANCE Signal to (Noise + Distortion) Ratio Total Harmonic Distortion (THD) 1 Peak Harmonic or Spurious Noise 1, 2 Intermodulation Distortion Second Order Terms Third Order Terms 1, 2 Channel-to-Channel Isolation DC ACCURACY Resolution Minimum Resolution for ...
Page 3
Parameter POWER SUPPLY Normal Operation Power-Down Full Power-Down Partial Power-Down (Internal Ref) Power Dissipation Normal Operation Auto Full Power-Down Throughput 1 kSPS Throughput 10 kSPS Throughput 100 kSPS Partial Power-Down (Internal Ref) Full Power-Down NOTES 1 ...
Page 4
... Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 150°C Plastic DIP Package, Power Dissipation . . . . . . . . . . 450 mW θ Thermal Impedance . . . . . . . . . . . . . . . . . . . . 105°C/W JA Lead Temperature, (Soldering 10 sec 260°C Linearity Model Error ± 1 LSB AD7811YN ± 1 LSB AD7811YR ± 1 LSB AD7811YRU ± 1 LSB AD7812YN ± 1 LSB AD7812YR ± 1 LSB ...
Page 5
V 1 REF C 2 REF V 3 IN1 AD7811 AGND 4 TOP VIEW V 5 IN2 (Not to Scale IN3 V 7 IN4 A0 8 Pin(s) Pin(s) AD7811 AD7812 Mnemonic REF ...
Page 6
AD7811/AD7812 TERMINOLOGY Signal to (Noise + Distortion) Ratio This is the measured ratio of signal to (noise + distortion) at the output of the A/D converter. The signal is the rms amplitude of the fundamental. Noise is the rms sum ...
Page 7
Control Register (AD7811) The Control Register is a 10-bit-wide, write only register. The Control Register is written to when the AD7811 receives a falling edge on its TFS pin. The AD7811 will maintain the same configuration until a new control ...
Page 8
AD7811/AD7812 Control Register (AD7812) The Control Register is a 10-bit-wide, write only register. The Control Register is written to when the AD7812 receives a falling edge on its TFS pin. The AD7812 will maintain the same configuration until a new ...
Page 9
V /AGND DIF/SGL CH1 IN4 /AGND ...
Page 10
AD7811/AD7812 CIRCUIT DESCRIPTION Converter Operation The AD7811 and AD7812 are successive approximation analog- to-digital converters based around a charge redistribution DAC. The ADCs can convert analog input signals in the range Figures 2 and 3 ...
Page 11
An example of the pseudo differential scheme using the AD7811 is shown in Figure 6. The relevant bits in the AD7811 Control Register are set as follows DIF/SGL = 1, CH1 = CH2 = 0, i.e., V pseudo differential with ...
Page 12
AD7811/AD7812 When using automatic power-down between conversions to improve the power performance of the part (see Power vs. Throughput) the switch SW1 will open when the part enters its power-down mode if using the internal on-chip reference. This provides a ...
Page 13
CONVERT t POWER-UP 2.3 s 1.5 s POWER-DOWN CONVST t CYCLE 100 s @ 10kSPS For example, if the AD7811 is operated in a continuous sam- pling mode with a throughput rate of 10 kSPS, PD1 = 1, PD0 ...
Page 14
AD7811/AD7812 OPERATING MODES The mode of operation of the AD7811 and AD7812 is selected when the (logic) state of the CONVST is checked at the end of a conversion. If the CONVST signal is logic high at the end of ...
Page 15
These modes are discussed in the Power-Up Times section of this data sheet. The timing diagram in Figure 17 shows how to operate the part in Mode 2. If the AD7811/AD7812 is powered down, the rising ...
Page 16
AD7811/AD7812 RFS. The first rising SCLK edge after the rising edge of the RFS signal causes DOUT to leave its high impedance state and data is clocked out onto the DOUT line and also on subsequent SCLK rising edges. The ...
Page 17
It is possible to implement a serial interface using the data ports on the 8051. This would also allow a full duplex serial transfer to be implemented. The technique involves “bit banging” an I/O port (e.g., P1.0) to generate a ...
Page 18
AD7811/AD7812 0.210 (5.33) 0.160 (4.06) 0.115 (2.93) 0.006 (0.15) 0.002 (0.05) SEATING PLANE OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 16-Lead Plastic DIP (N-16) 0.840 (21.33) 0.745 (18.93 0.280 (7.11) 0.240 (6.10 PIN 1 0.060 ...
Page 19
OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 20-Lead Plastic DIP (N-20) 1.060 (26.90) 0.925 (23.50 0.280 (7.11) 0.240 (6.10 PIN 1 0.060 (1.52) 0.015 (0.38) 0.210 (5.33) MAX 0.160 (4.06) 0.115 (2.93) SEATING 0.100 0.070 ...