+3.3 V/+5 V Multiplying a 12-Bit DACs AD7943/AD7945/AD7948 FUNCTIONAL BLOCK DIAGRAMS FEATURES 12-Bit Multiplying DACs V R DD FB Guaranteed Specifications with +3.3 V/+5 V Supply AD7943 0.5 LSBs INL and DNL I OUT1 12-BIT DAC V REF Low Power: 5 mW typ I OUT2 Fast Interface CLR AGND 40 ns Strobe Pulsewidth (AD7943) DAC REGISTER LD1 40 ns Write Pulsewidth (AD7945, AD7948) LD2 Low Glitch: 60 nV-s with Amplifier Connected INPUT SHIFT REGISTER SRI SRO Fast Settling: 600 ns to 0.01% with AD843 APPLICATIONS Battery-Powered Instrumentation Laptop Computers Upgrades for All 754x Series DACs (5 V Designs) STB1 STB2 STB3 STB4 DGND V R DD FB GENERAL DESCRIPTION AD7945 I OUT1 The AD7943, AD7945 and AD7948 are fast 12-bit multiplying V 12-BIT DAC REF AGND DACs that operate from a single +5 V supply (Normal Mode) 12 and a single +3.3 V to +5 V supply (Biased Mode). The CS AD7943 has a serial interface, the AD7945 has a 12-bit parallel INPUT LATCH WR interface, and the AD7948 has an 8-bit byte interface. They will 12 replace the industry-standard AD7543, AD7545 and AD7548 DB11DB0 DGND in many applications, and they offer superior speed and power consumption performance. V R DD FB The AD7943 is available in 16-lead DIP, 16-lead SOP (Small I OUT1 Outline Package) and 20-lead SSOP (Shrink Small Outline V 12-BIT DAC REF AGND Package). 12 AD7948 The AD7945 is available in 20-lead DIP, 20-lead SOP and 20- DF/DOR DATA OVERRIDE LOGIC lead SSOP. CTRL 12 The AD7948 is available in 20-lead DIP, 20-lead SOP and 20- DAC REGISTER LDAC lead SSOP. 12 WR CONTROL INPUT REGISTERS LOGIC CSLSB 12 DATA STEERING LOGIC CSMSB 8 DB7DB0 DGND REV. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. use, nor for any infringements of patents or other rights of third parties Tel: 781/329-4700 World Wide Web Site: 1 AD7943/AD7945/AD7948SPECIFICATIONS (AD7943: V = +4.5 V to +5.5 V V = V = AGND = 0 V V = +10 V T = T to T , unless otherwise noted. NORMAL MODE DD IOUT1 IOUT2 REF A MIN MAX AD7945, AD7948: V = +4.5 V to +5.5 V V = AGND = 0 V V = +10 V T = T to T , unless otherwise noted.) DD IOUT1 REF A MIN MAX 2 2, 3 Parameter B Grades T Grade Units Test Conditions/Comments ACCURACY 12 Resolution 12 12 Bits 1 LSB = V /2 = 2.44 mV when V =10 V REF REF Relative Accuracy 0.5 0.5 LSB max Differential Nonlinearity 0.5 0.5 LSB max All Grades Guaranteed Monotonic over Temperature Gain Error T to T 2 2 LSB max MIN MAX 4 Gain Temperature Coefficient 2 2 ppm FSR/C typ 5 5 ppm FSR/C max Output Leakage Current I OUT1 +25C 10 10 nA max See Terminology Section T to T 100 100 nA max Typically 20 nA over Temperature MIN MAX REFERENCE INPUT Input Resistance 6 6 k min Typical Input Resistance = 9 k 12 12 k max DIGITAL INPUTS V , Input High Voltage 2.4 2.4 V min INH V , Input Low Voltage 0.8 0.8 V max INL I , Input Current 1 1 A max INH 4 C , Input Capacitance 10 10 pF max IN DIGITAL OUTPUT (AD7943 SRO) For 1 CMOS Load Output Low Voltage (V ) 0.2 0.2 V max OL Output High Voltage (V)V 0.2 V 0.2 V min OH DD DD POWER REQUIREMENTS V Range 4.5/5.5 4.5/5.5 V min/V max DD 4 Power Supply Sensitivity Gain/V 75 75 dB typ DD I (AD7943) 5 5 A max V = V 0.1 V min, V = 0.1 V max. DD INH DD INL SRO Open Circuit. No STB Signal. Typically 1 A. Typically 100 A with a 1 MHz STB Frequency. At Input Levels of 0.8 V and 2.4 V, I Is Typically 2.5 mA. DD I (AD7945, AD7948) 5 5 A max V = V 0.1 V min, V = 0.1 V max. DD INH DD INL Typically 1 A. At Input Levels of 0.8 V and 2.4 V, I Is Typically 2.5 mA. DD NOTES 1 The AD7943, AD7945 and AD7948 are specified in the normal current mode configuration and in the biased current mode for single-supply applications. Figures 14 and 15 are examples of normal mode operation. 2 Temperature ranges as follows: B Grades: 40C to +85C T Grade: 55C to +125C. 3 The T Grade applies to the AD7945 only. 4 Guaranteed by design. Specifications subject to change without notice. 2 REV. B